lab-report-analysis-of-a-two-component-alloy
pdf
School
Massachusetts Bay Community College *
*We aren’t endorsed by this school
Course
101
Subject
Chemistry
Date
Apr 3, 2024
Type
Pages
12
Uploaded by CorporalFireMosquito35
LAB Report Analysis of a Two-Component Alloy
Chemistry (Michigan State University)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
LAB Report Analysis of a Two-Component Alloy
Chemistry (Michigan State University)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
OBJECTIVE
The experiment was conducted in order for students to know how to apply the Ideal Gas Law to
analyse and determine the composition of a zinc-aluminum alloy by calculation of the mass
percentage of each metal in the alloy.
INTRODUCTION
Most metals, such as zinc, react with strong acids, like HCl, to produce hydrogen gas and metal
salt. The reaction below shows that in every mole of magnesium that reacts one mole of
hydrogen gas is produced.
Zn (s) + 2 H
+
(aq)
Zn
2+
(aq) + H
2
(g)
Aluminum also reacts irreversibly with HCl similar to the example given above. The ionic
equation below shows that it takes 2 moles of aluminum to react with acid to produce 3 moles of
hydrogen gas.
2 Al (s) + 6 H
+
(aq)
2 Al
3+
(aq) + 3H
2
(g)
Based on the chemical equations shown above, the amount of gas produced by one gram of
magnesium is different from the amount produces from one gram of aluminum. Hence, to
determine the amount of hydrogen gas evolved and the percentages of Mg and Al in the given
alloy, we need to have the initial weight of each metal.
The number of moles of hydrogen gas produced can be determined using the Ideal Gas equation:
PV = nRT
n = PV
RT
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Our goal to determine the percentages of metals present in the alloy can be calculated using the following equation:
Mass of Zinc + Mass of Aluminum = Mass of Alloy
mol of H
2 from Zn + mol of H
2
from Al = total mol of H
2
collected
Hence, using the Ideal Gas equation, we get:
mol of H
2 from Zn + mol of H
2
from Al = PV
RT
Where:
P:
Partial pressure of hydrogen gas
V:
Volume of the hydrogen gas
T:
Temperature of the hydrogen
n:
moles of hydrogen gas collected
R:
universal gas constant
PROCEDURE
Before the commencement of the experiment, all the materials needed such as Zn-Al alloy (good
for three trials), empty capsule, graduated cylinder, bottle container, beaker, corks, rubber tubing,
iron stand with clamp, and thermometer was collected. Then, a set-up according the the
following diagram was made:
Figure 1: Experimental Set-up
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
It was made sure that there were no leaks in between the set-up to prevent the escape of the
hydrogen gas.
The mass of the Zn-Al alloy (3 replicates) were recorded as well as the mass of the bottle and the
water before and after the reaction took place. About 50 – 75 mL of dilute (6M) hydrochloric
acid was placed in the generator flask. The encapsulated alloy was dropped into the generator
flask, allowing the acid to dissolve the capsule and react with the allow giving off hydrogen gas.
The system was allowed to equilibrate for about 10 minutes before measuring the difference of
water level between the bottle and the beaker. The temperature of the water from the big bottle
was measured and the remaining water was weighed. The temperature of the gas above the water
was also measured. The experiment was done for three replicates using the same acid solution
for every trial. The water and acid solution used in the experiment was properly discarded.
RESULTS AND CALCULATIONS
Table 1 below shows all the analytical data gathered from the experiment.
Table 1. Raw Data Gathered from the Experiment
Trial 1
Trial 2
Trial 3
Mass alloy reacted (g)
2.5099
1.3676
1.3271
Mass Large Bottle filled with water (g)
4652
4720
4636
Mass Large Bottle after experiment (g)
2007
3277
3242
Atmospheric pressure (mm Hg)
742
742
742
Volume of water displaced (L)
2.65
1.45
1.4
Difference in water heights in bottles (cm)
11.74
7.13
7.23
Type "1" if level in starting bottle is higher at end of experiment. (Subtract from Dalton’s Law) Type "2" if level in displaced water bottle is higher. (Add to Dalton’s Law)
2
1
1
Temperature of gas in bottle (
o
C)
24.3
24.7
23.4
Temperature of water in bottle (
o
C)
24.4
24.9
23.3
Vapor pressure of water (mm Hg)
22.4
23.8
21.1
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
TRIAL 1
Calculate the pressure of dry hydrogen gas
The pressure of dry hydrogen can be calculated using Dalton’s Law which states that the total
pressure is equal to the sum of the partial pressure of the individual gases in the mixture.
P
bar
= P
H2O
+ P
H2 ± P
ΔH
Note that in the first trial, the level in displaced water bottle is higher than the starting bottle.
Hence, P
ΔH
will be added in the equation.
P
ΔH
= Height difference
(
mm
)
13.6
= 117.4
mm
13.6
=
8.6 mmHg
P
bar
= 742 mmHg
P
H2O
= 22.4 mmHg
P
bar
= P
H2O
+ P
H2 +
P
ΔH
P
H2
= P
bar
- P
H2O - P
ΔH = (742 – 22.4 – 8.6) mmHg = 711 mmHg or
0.9355 atm (Pressure of dry
hydrogen)
Calculate the number of moles of hydrogen gas produced
n = PV
RT
= (
(
0.9355
atm
) (
2.65
L
)
(
0.08206
L.atm
mol. K
)
(
297.45
K
)
)
= 0.1017 moles of H
2
gas
Calculate the % Zn and % Al in the Alloy
Mass Zn + Mass Al = Mass Alloy
Mass Al = Mass Alloy – Mass Zn
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Mass Zn (
1
mol Zn
63.38
g
)(
1
mol H
2
1
molZn
)
+ (Mass Alloy – Mass Zn)
(
1
mol Al
26.98
g
)(
3
mol H
2
2
molZn
)
=
0.1017 mol H
2
Mass Zn (
1
mol Zn
63.38
g
)(
1
mol H
2
1
molZn
)
+ (2.5099 g – Mass Zn)
(
1
mol Al
26.98
g
)(
3
mol H
2
2
molZn
)
= 0.1017
mol H
2
Mass Zn = 0.95 grams
% Zn = 0.95
grams Zn
2.5099
grams Alloy
x 100% = 37.82% Zn
% Al =
(
2.5099
grams
−
0.95
grams
)
2.5099
grams Alloy
x 100% = 62.18% Al
Zn and Al ratio = 1:2
Calculate the number of moles of hydrogen gas produced from Zn and Al
Moles of H
2
from Zn = 0.95 grams Zn (
1
mol Zn
63.38
g
)(
1
mol H
2
1
molZn
)
= 0.0149 moles H
2
Moles of H
2
from Al = (2.5099 grams – 0.95 grams)
(
1
mol Al
26.98
g
)(
3
mol H
2
2
molZn
)
= 0.0867 moles H
2
Parameters for the second and third trials were calculated in a similar manner.
The table shown below summarizes the calculated parameters for the three trials conducted.
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Table 2: Calculated Parameters for Three Trials
DISCUSSION
The experiment was conducted in triplicate in order to evaluate the precision of the method
based on the values of the results. It can be observed that the percent components of alloys in the
three trials conducted is highly similar with 36.53 mean value for % Zn and a very acceptable
standard deviation of 1.13; 63.46 mean value for % Al and a good standard deviation of 1.12.
It’s good to note that although trial 1 used a weight of alloy twice the amount of trials 2 and 3,
the percent composition of the alloys for all trials are significantly close to each other. This
means that the procedure utilized can be successfully used for the determination of the
percentage components of two-component alloy whatever the amount of alloy used.
CONCLUSION
Trial 1
Trial 2
Trial 3
Pressure of dry H
2
(mmHg)
710.97
723.44
726.22
Pressure of dry H
2
(atm)
0.9355
0.9519
0.9555
Temperature of gas in bottle (
o
C)
24.30
24.70
23.40
Molar Gas Constant (R) L*atm/(mol*K)
0.08206
0.08206
0.08206
Moles of H
2
produced from Zn (mol)
0.0149
0.00778
0.00748
Moles of H
2
produced from Al (mol)
0.0867
0.04862
0.0474
Total moles of H
2
produced (mol)
0.1017
0.05636
0.05488
Mass of Zinc (g)
0.9492
0.4931
0.4742
% Zn
37.82
36.05
35.73
Average % Zn
36.53
Standard Deviation for % Zn
1.13
Mass of Al (g)
1.5606
0.8745
0.8529
% Al
62.18
63.94
64.27
Average % Al
63.46
Standard Deviation for % Al
1.12
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
The experimental procedure utilized is a good yet simple way to determine the percent metal
composition of alloys. However, this may not be recommended when the type of the metals used
is unknown and yet to be determined because of the type of calculations necessary. Also one has
to effectively estimate the amount of the acid to be used for the reaction process because if the
acid used is not sufficient then you will not be able to accurately calculate for the required
parameters to come up with the final percent composition values.
POST LAB QUESTIONS
1.
Why was it not necessary to discard and refill the generator flask with fresh 6 M
HCl for subsequent reactions? Show a calculation to demonstrate your reasoning.
The volume of 6 M HCl acid used in the experiment was 75 mL and the number of moles of H
+
present is equal to 0.450 mole H
+
(n = M x V). The total amount of alloy used for three trials is
5.2046 grams. The following are the chemical reactions that took place in the generator flask.
Zn (s) + 2 H
+
(aq)
Zn
2+
(aq) + H
2
(g)
2 Al (s) + 6 H
+
(aq)
2 Al
3+
(aq) + 3H
2
(g)
Total amount of Zn used = 1.9165 g
Total amount of Al used = 3.288 g
Total moles of H
+
needed to dissolve Zn = 1.9165 g Zn 2
mol H
+
¿
1
mol Zn
¿
(
1
mol Zn
63.38
g
)
¿
= 0.06047 moles
Total moles of H
+
needed to dissolve Al = 3.288 g Al 6
mol H
+
¿
2
mol Al
¿
(
1
mol Al
26.98
g
)
¿
= 0.3656 moles
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
The total number of moles of H
+
needed to react to every component of the alloy for three trials
is 0.42607 moles, hence the HCl used was enough for the whole set-up. 2.
In an experiment similar to yours, students were given an unknown sample that
produced H
2
S or NH
3
gas. What problem(s), if any, might arise if the same procedures as
this experiment were followed?
When this experiment will be repeated using other samples that produce H
2
S or NH
3
gas,
the outcome will not be the same. The polarities of the gases dictate the outcome of the
experiment. The non-polar H
2
gas produced by reacting a metal with HCl does not readily form
bonds with water molecules which causes the displacement to happen. However, when H
2
S or
NH
3
gases are produced, they will react with water because of their polar nature. Hence, no water
displacement happens for this case.
3.
Why is it not necessary to consider the amount of air that was in the generator flask
at the start of the reaction?
The amount of air present in the generator flask was not considered because both the
generator flask and the bottle were saturated with air or water molecules and the only force that
will cause any change is the pressure that will be influenced by the production of the hydrogen
gas. 4.
If there was a leak in the rubber tubing that allowed approximately 150 mL of H
2
gas to escape, how would it affect the relative amounts (% values) that you have calculated
as the results? Would the percent zinc in the sample appear to be high, low, or remain the
same? Show a calculation to justify your answer.
In the event that 150 mL of hydrogen escapes from the set-up, the % values will change,
specifically, the % Zn will increase and the % Al will decrease due to the ratio of their reaction
coefficients.
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Sample calculations (data from trial 1):
Number of moles of hydrogen gas n = PV
RT
= (
(
0.9355
atm
) (
2.65
−
0.15
L
)
(
0.08206
L.atm
mol. K
)
(
297.45
K
)
)
= 0.09581
moles
Mass Zn (
1
mol Zn
63.38
g
)(
1
mol H
2
1
molZn
)
+ (Mass Alloy – Mass Zn)
(
1
mol Al
26.98
g
)(
3
mol H
2
2
molZn
)
=
0.09581 moles
Mass Zn (
1
mol Zn
63.38
g
)(
1
mol H
2
1
molZn
)
+ (2.5099 g – Mass Zn)
(
1
mol Al
26.98
g
)(
3
mol H
2
2
molZn
)
= 0.09581
moles
Mass Zn = 1.097 g
Mass Al = 2.5099 g – 1.097 g = 1.4129 g % Zn = 1.097
g
2.5099
g
x
100
=
43.71%
(Trial 1 %Zn is 37.82%) hence, there is an increase in % Zn
% Al = 1.4129
g
2.5099
g
x
100
=
56.29%
(Trial 1 %Al is 62.18%) hence, there is a decrease in % Al
5.
What assumptions do we make regarding the temperatures of the generator and
collection flask? Are they valid?
It is assumed that the reaction in the experiment took place at a constant temperature and
pressure both in generator flask and collection flask. The assumptions are valid in ideal gas law
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
because when there is a slight change of temperature to the experimental set-up, the value of the
parameters calculated will not be the same. Also, the net energy for the reaction will be zero
because the energy released from the generator flask via the production of hydrogen gas will be
utilized in the collection flask which influences the displacement of water.
6.
How would the calculated number of moles of H
2
collected change if the generator
flask were not given time to fully equilibrate?
The generator flask should be allowed to equilibrate for several minutes to make sure that
the reaction is totally complete and no more formation of hydrogen gas is going on. If the
generator flask will not be allowed to equilibrate, a possible error in the measurement of the
volume of the water displaced and hence the volume of the hydrogen gas formed. Incorrect
measurement of the volume of hydrogen gas formed will directly affect the calculation for the
number of moles.
7.
The molecular mass of the gas can be determined using an application of Ideal Gas
Law:
PV = nRT
and
n = m
MM
so
PV = m
MM
RT
An unknown gas with a mass of 1.545 ± 0.001 g at a temperature of 298.5 ± 0.1 K
and a pressure of 715 ± 1 mm Hg is found to occupy 0.260 ± 0.001 L. Determine the molar
mass and absolute error of this unknown. Assume that the gas constant, R, has no error.
PV = m
MM
RT (0.94079 atm)(0.260 L) = 1.545
g
MM
(
0.08206
L.atm
mol.K
)
(298.5 K) MM
=
1.545
g
(
0.94079
atm
)(
0.260
L
)
(
0.08206
L.atm
mol.K
)
(298.5 K) = 154.72 g/mol
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Absolute Error
154.72
= 0.001
1.545
+ 0.1
298.5
+ 1
715
+ 0.001
0.260
Absolute error = 0.963 ≈ 1
Hence, 154.72 ± 1 g/mol
Downloaded by Immacula Mayer (ImMayer@Wellpath.us)
lOMoARcPSD|20622301
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Related Documents
Related Questions
O Homework in Chem101 - due Su X
My Questions | bartleby
( Periodic Table – Royal Society of
how to take a screenshot on an
+
A learn.maricopa.edu/courses/1132256/modules/items/19018052
CHM151 17003 > Modules > Weeks 8 & 9 - Chapter 7 > Homework in Chem101 - due Sunday night
CG 2020 FALL CRED
Question 37 of 4
Submit
Account
Home
Complete the balanced neutralization equation for the reaction below:
Announcements
Dashboa
|Modules
HCIO-(aq) + CSОН(ag) —
rd
Concourse Syllabus
Courses
Grades
D2+ N3+
D4+
Cisco Webex
Groups
1
2
3
4
7
8
9.
Tutoring/Learning
Center
Calendar
Os
Do
Inbox
(s)
(1)
(g) (aq)
History
Cs
H
CI
Help
• Previous
Next »
Library
1:03 PM
O Type here to search
10/18/2020
+
arrow_forward
M9. Readings
* OWLV2 | Assig X MindTap - Cen x
g.cengage.com/static/nb/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld-785765&
MindTap- Cen x
G amu of ca-G x
b My Question x +
CENGAGE MINDTAP
Chapter 8: Chemical Composition
L.
E AA
Tools
Problems
45. Calculate the percent by mass of each element in the following compounds.
a. HC103
b. UF4
с. СаН2
d. Ag,S
e. NaHSO3
f. MnO2
arrow_forward
O Julie and the Phantoms - Full X
A MYOTC - Ozarks Technical Comm x
21SP CHM-160-101
* OWLV2 | Online teaching and lear x
b Homework Help and Textbook Sc X
+
A east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take
Chapter 1
Question 18
[References)
1 pt
EXERCISE Unit Conversion
Question 19
1 pt
Drag conversion units onto the boxes in the equation to make conversions. Some boxes can be left empty. Click on a
unit to remove it from its position.
Question 20
1 pt
1 pt
1 cm Cu
9 g Cu
9.5 x 1021 atoms Cu
= 1g Cu
=
Question 21
1 kg
1000 g
1 cm3
= 1 mL
Question 22
1 pt
1 L
1000 cm?
=
Question 23
O 1 pt
Question 24 O 1 pt
Question 25
1 pt
980 kg x
Question 26
1 pt
Question 27
1 pt
A piece of copper has a mass of 980 kg. How many atoms does the sample contain?
Question 28
1 pt
In the boxes above, enter the correct setup that would be used to solve this problem.
Question 29
O 1 pt
Question 30 O
1 pt
Recheck
Next (1 of 3)
23rd attempt
Question 31
1 pt
Incorrect…
arrow_forward
Chrome File Edit View History Bookmarks
Gimmensely
|||
* ALEKS
0
ne
Explanation
Profiles
A ALEKS-Sat
Low FODMAP ric M Gmail
Check
Tab
Window Help
G is lodine a mx A ALEKS
@ www-awa.aleks.com/alekscgi/x/isl.exe/1o_u-IgNslkr7j8P3jH-IQgHlvdL2donGg9pinQUm9kiGJhghYuAIZLqdtEEgiJQTK5Ij49wHEXm8hvCYgFhBQ-k3zPGg2eq
Campbell Biology.
KH Chapter Content -... Q Chemistry lab Flas... Untitled documen....
X
O ELECTROCHEMISTRY
Writing and balancing complex half-reactions in basic solution
APRI
14
School planner
Write a balanced half-reaction for the oxidation of gaseous arsine (AsH₂) to aqueous arsenic acid (H₂ASO4) in basic aqueous solution. Be sure to add physical
state symbols where appropriate.
48
X ☐ (312) ALEKS X Co. Main Group X
tv
2
B
X
Periodic Tab X
C
A
Q 2 Fri Apr 14 10:00 PM
Periodic Tab x | +
** O
Sabrina V
alo
2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Pivacy Center | Accessibility
SU
989
arrow_forward
Chrome
File
Edit View History Bookmarks Profiles
Tab Window Help
I Watch Gilmore Girls | Ne x
x A ALEKS - David Teague - xA ALEKS - Reyna Garcia - x
1 9,61
C
i www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-IVDWKW_BBZZI6tTytly4Fcfu6zOtof80MM9sGfAPlz6IggLxsfCPjPf
Spotify Web Playe. M Common Ethical D.
Objective Knowledge Check
Question 1
Calculate the mass of forsterite (Mg, SiO,) that contains a trillion (1.00 × 10'“) oxygen atoms.
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
I Don't Know
Submit
O 2022 McGraw Hill LLC. All Rights F
APR
22
80
888
000
F1
F2
DII
F3
F4
F6
F7
FB
23
2$
&
3
4.
7
8
< CO
arrow_forward
Chrome
Edit
View
History
Bookmarks
Profiles
Tab
Window
Help
File
(5 unread) - dt x ALEKS
ALEKS - David
A ALEKS - Re-
Watch Gilmore
A www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IvdWKW_BBZZ16tTytly4Fcfu6zOtOf8oM
Spotify Web Playe.. M common Ethical D.
O CHEMICAL REACTIONS
Interconverting number of atoms and mass of compound
Calculate the number of hydrogen atoms in a 50.0 g sample of ammonia (NH,.
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
x10
Explanation
Check
APR
18
...
arrow_forward
M Gmail
T
(19) Hira Khan Got Emotion X
ALEKS - Rafia Riaz - Knowle X G A small part of a crystal latti X C A small part of a crystal latti X
www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-lvdw7xgLCkqMfg8yaFKbD9GafJstkYLIJnusw-UPvlc49wZ0Y-C-Aa6JgU79qspYVPxe6nZcLGhglo61yWvnvbFEk1B_vMo?10Bw7QY... ☆
YouTube
Maps
Translate
Module Knowledge Check
News
Acetic acid and water react to form hydronium cation and acetate anion, like this:
HCH,CO,(aq)+H,O() → H_O* (aq)+CH,CO,(aq)
What is the rate of the forward
reaction before any HCH3CO2 has
been removed from the flask?
What is the rate of the forward
reaction just after the HCH3CO₂ has
been removed from the flask?
What is the rate of the forward
reaction when the system has again
reached equilibrium?
I Don't Know
How much less HCH3CO₂ is in the
flask when the system has again
reached equilibrium?
Type here to search
Imagine 86. mmol of HCH3CO₂ are removed from a flask containing a mixture of HCH₂CO₂, H₂O, H₂O¹ and CH3CO₂ at equilibrium,…
arrow_forward
е
File
Edit
View
History
Bookmarks
Profiles
Tab
Window
Help
Watch Gilmore Girls | Ne X
O ALEKS
A ALEKS - David Teague - x
A ALEKS - RE
A www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IvdWKW_BBZZI6tTytly4Fcfu6zOtOf80M
Spotify Web Playe... M Common Ethical D...
Objective Knowledge Check
Question 7
What is the hybridization of the central atom in the sulfur tetrafluoride (SF.) molecule?
I Don't Know
Submit
O 2022
APR
22
arrow_forward
me
2
esc
Edit
File
View
|||
!
ALEKS
History
ALEKS - Tiffany Te-L-Peng - L X
C www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-liGBdp5ulp5VqUnMDyPOVaX6q0CRPLZSQ5NDSL9PhmOKLh4C
F
Explanation
@
Bookmarks Profiles
O SUBSTITUTION REACTIONS
Predicting the effect of carbocation stability on the rate of...
Substrate A
CI
Br
For each pair of substrates below, choose the one that will react faster in a substitution reaction, assuming that:
1. the rate law for the substitution reaction has a first-order dependence on the concentration of the alkyl halide, and
2. doesn't depend on the concentration of the other reactant at all.
Br
Tab
X
Check
Window
Help
Substrate B
CI
+
Br
Faster Rate
(Choose one)
(Choose one)
(Choose one)
MacBook Pro
G Search or type URL
▼
X
Ⓒ2022 McGraw Hill LLC. All Rights Rese
arrow_forward
*CO
11 of 16 (>
Review Constants | Periodic Table
Part A
HN-HO-HƆ
Spell out the full name of the compound.
Submit
Request Answer
Part B
H.
N.
Spell out the full name of the compound.
P Pearson
Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy Permissions | Contact Us /
12:14 AM
xp ジ
10/29/2020
Delete
LEGO
Backspace
6.
arrow_forward
File Edit View History Bookmarks Profiles
A ALEKS-LX
Auerbach x
Mall-La X
Untitled dx A ALEKS-L X
www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-lvTqeviKFP6W0cqJcWJdIACROQwyw24GWHIn6wmDXTUN80MO03t0lVprAPxlkn..
ity and... 18.3 Gibbs Free E... 5.3 Enthalpies of... 18.5 Gibbs Free E... Reading Schedule 19.6 Reduction Po...Ya SOLUTION: The le...
O KINETICS AND EQUILIBRIUM
Calculating an equilibrium constant from a heterogeneous...
Nickel carbonyl decomposes to form nickel and carbon monoxide, like this:
Ni (CO) (9) Ni(s)+4 CO(g)
!
1
stion
compound amount
Ni (CO)4 0.115 g
K = 0
Calculate the value of the equilibrium constant K for this reaction. Round your answer to 2 significant digits.
Explanation
Q
A
all
Ni
CO
At a certain temperature, a chemist finds that a 3.5 L reaction vessel containing a mixture of nickel carbonyl, nickel, and carbon monoxide at equilibrium has
the following composition:
C
N
17.954
CO
2
B
34.1 g
1.46 g
W
comm
S
Check
X
X
#3
E
D
0.9
10
Tab Window Help
4
C
X…
arrow_forward
marks
People
Tab
Window
Help
* 令
100% 47
linois State University : CHE 1 X
* MindTap - Cengage Learning
G so3 molecular geometry - Goo X
i/evo/index.html?deploymentld355750828934189288909969212&elSBN=9781305657571&snapshotld=2199898&id=1..
MINDTAP
nd Quick Prep
Use the References to access important values if needed for this question.
Orbitals which result from solving the Schrodinger Wave Equation can be represented by electron "cloud" pictures.
The shapes of the orbitals are distinguished by their nodes, places where the electron density equals zero.
Erwin
Schrödinger
Based upon the number of spherical and angular nodes, label the orbitals below as 1s, 2p, etc.
Specify the value of n and I for each:
This is a
orbital
This is a
orbital
This is a
orbital
n =
and I=
n =
and /
n
and I
Submit Answer
5 question attempts remaining
arrow_forward
Chrome
File
Edit
View
History
Bookmarks People
Tab
Window
Help
HCc Dashbc X
E Buy Es: X
G find so x
© Periodi x A ALEKS X
M Mathwa X
MUc Chapte x
E New m X
www-awn.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IQİHQRDYV_6Ux63SypJXz0Coxvwqgg4JkWI7Cge0xmXkyh... ☆
O GASES
Interconverting atmospheres and torr
Jacqueline
The ocean pressure at the depth of the Titanic wreck is 400. atm. Calculate the ocean pressure in mmHg and torr. Round each
of your answers to 3 significant digits.
mm Hg
x10
torr
arrow_forward
Collig Notes (1).pdf
A ALEKS -Jeneen Abdelra x
M Mathway | Algebra Prol x
G molar mass of zinc chi X
Launch Mecting Zoom x
G 0 16kg to g-Google Se x
www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-lix5uFZVj2iEJjQd1WoxT77ErtzZpGbzESWCdKA-XuxbGs-AaPzd3NjMOpEj fK yyMe4DwaRdZ3h4BNyNo400u
O GASES, LIQUIDS, AND SOLIDS
三I
Using the Kf and Kb equations with electrolytes
Jeneen V
A certain liquid X has a normal freezing point of -0.10 °C and a freezing point depression constant K,=4.18 °C-kg-mol
Calculate the freezing point of a
solution made of 38.g of urea (CH,N,O) dissolved In 650. g of X.
4"
Round you answer to 2 significant digits.
I °C
x10
© 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy | Accessibility
Check
Explanation
Gp
arrow_forward
The question and infromation should all be there to answer question. the Answer should be malonic acid
arrow_forward
MyEPCC
←
→
G Gmail
Mail - Chavez, Daniela M. X A ALEKS - Daniela Chavez X bChemistry Homework Hel X
www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-IJluBpcUFhvlTCeeBZbufuBYTi0Hz7m7D3ZccTVaNa6JcZm9qGp3Ro656Czy4sWrUOXL... L
0 -=-/24
YouTube
K
X
= Initial Knowledge Check
Maps
I Don't Know
Courses
Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction entropy of the following chemical reaction:
4H₂O₂ (1) + PbS (s) → PbSO (s) + 4H₂O (1)
Round your answer to zero decimal places.
Submit
x10
X
X
Question 3
+
Daniela
00.
Ar
x
© 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility
arrow_forward
↓
E ALL GAMING >
H
Share
7
Q Search
D
U
40
Download
JO
K
M
8
O
<
↓
Bios
Gho
9
alt
PE
Draw the missing products and/or reagents in the
following multistep synthesis. Ignore any inorganic
byproducts.
lys
........
L
NBS
hv
Select to
Draw
CHICO
Na
THF
Select to
Draw
Ha
Pd(C)
الالال
الاكل
الاك
PPI
app.101edu.co
K
?
a
{
[
/
1.0₂
100 00
2. CH₂SCH₂
Select to
Draw
FV
}
]
prt sc
←
2
Problem 5 of 5
delete
backspace
日
enter
A
B
C
E
D
home
T shift
1
^
2 equivalents NaBH
EtOH
1.2 equivalents NaH
2. H₂O
1. H₂O*
2.2 equivalents NaBH.
H₂O
HCI
num
lock
1.2 equivalents BH-THF
2. H₂O₂, NaOH
Ⓒ
Done
7
home
A
4
←
end
1
end
ng up
5
2
O
10:30 AM
7/17/2023
ins
J
9
pg up
Submit
6
X
3
pg dn
del
enter
BANG SO
arrow_forward
. Experimental data mass (g) and volume (mL) of a substance was gathering, recorded, and plotted in Figure 1.
a.
Correctly la bel the graph axis (include units).
b. The equation for the trendline (y = mx + b) is displayed on the graph. Which variable, in the equation,
equals the density of the substance?
A1
feMass
B
D
Mass
Volume
2.
1,8
2,19
Mass vs. volume
3
3,15
4,08
4,13
5,57
7.
6,7
8,34
6.
y= 0,794x-0.064
8
6.
10
11.
2
4.
10
13
14
15
Figure 1: Plotting of Mass vs. Volume of a Substance.
bttps://www.chemisalforums.com/index.php?toric=69575.0
Life University
CHM 111
March 2021
Default Page Style
English (USA)
arrow_forward
M9. Readings X
* OWLV2 | Assig X
* MindTap - Cen X
MindTap - Cen X
G amu of ca - Go X b My Questions
engage.com/static/nb/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld%3D785765&
C
<<
CENGAGE MINDTAP
Q Search this cour
Chapter 8: Chemical Composition
ž AA A
Answer +
47. Calculate the percent by mass of the element listed first in the formulas for each of the following
compounds.
a. methane, CH4
b. sodium nitrate, NaNO3
c. carbon monoxide, CO
d. nitrogen dioxide, NO2
e. 1-octanol, Cg H18 O
f. calcium phosphate, Caz (PO4)2
g. 3-phenylphenol, C12 H10O
h. aluminum acetate, Al(C,H,02),
48. Calculate the norgont h
!!
arrow_forward
SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY
Related Questions
- O Homework in Chem101 - due Su X My Questions | bartleby ( Periodic Table – Royal Society of how to take a screenshot on an + A learn.maricopa.edu/courses/1132256/modules/items/19018052 CHM151 17003 > Modules > Weeks 8 & 9 - Chapter 7 > Homework in Chem101 - due Sunday night CG 2020 FALL CRED Question 37 of 4 Submit Account Home Complete the balanced neutralization equation for the reaction below: Announcements Dashboa |Modules HCIO-(aq) + CSОН(ag) — rd Concourse Syllabus Courses Grades D2+ N3+ D4+ Cisco Webex Groups 1 2 3 4 7 8 9. Tutoring/Learning Center Calendar Os Do Inbox (s) (1) (g) (aq) History Cs H CI Help • Previous Next » Library 1:03 PM O Type here to search 10/18/2020 +arrow_forwardM9. Readings * OWLV2 | Assig X MindTap - Cen x g.cengage.com/static/nb/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld-785765& MindTap- Cen x G amu of ca-G x b My Question x + CENGAGE MINDTAP Chapter 8: Chemical Composition L. E AA Tools Problems 45. Calculate the percent by mass of each element in the following compounds. a. HC103 b. UF4 с. СаН2 d. Ag,S e. NaHSO3 f. MnO2arrow_forwardO Julie and the Phantoms - Full X A MYOTC - Ozarks Technical Comm x 21SP CHM-160-101 * OWLV2 | Online teaching and lear x b Homework Help and Textbook Sc X + A east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take Chapter 1 Question 18 [References) 1 pt EXERCISE Unit Conversion Question 19 1 pt Drag conversion units onto the boxes in the equation to make conversions. Some boxes can be left empty. Click on a unit to remove it from its position. Question 20 1 pt 1 pt 1 cm Cu 9 g Cu 9.5 x 1021 atoms Cu = 1g Cu = Question 21 1 kg 1000 g 1 cm3 = 1 mL Question 22 1 pt 1 L 1000 cm? = Question 23 O 1 pt Question 24 O 1 pt Question 25 1 pt 980 kg x Question 26 1 pt Question 27 1 pt A piece of copper has a mass of 980 kg. How many atoms does the sample contain? Question 28 1 pt In the boxes above, enter the correct setup that would be used to solve this problem. Question 29 O 1 pt Question 30 O 1 pt Recheck Next (1 of 3) 23rd attempt Question 31 1 pt Incorrect…arrow_forward
- Chrome File Edit View History Bookmarks Gimmensely ||| * ALEKS 0 ne Explanation Profiles A ALEKS-Sat Low FODMAP ric M Gmail Check Tab Window Help G is lodine a mx A ALEKS @ www-awa.aleks.com/alekscgi/x/isl.exe/1o_u-IgNslkr7j8P3jH-IQgHlvdL2donGg9pinQUm9kiGJhghYuAIZLqdtEEgiJQTK5Ij49wHEXm8hvCYgFhBQ-k3zPGg2eq Campbell Biology. KH Chapter Content -... Q Chemistry lab Flas... Untitled documen.... X O ELECTROCHEMISTRY Writing and balancing complex half-reactions in basic solution APRI 14 School planner Write a balanced half-reaction for the oxidation of gaseous arsine (AsH₂) to aqueous arsenic acid (H₂ASO4) in basic aqueous solution. Be sure to add physical state symbols where appropriate. 48 X ☐ (312) ALEKS X Co. Main Group X tv 2 B X Periodic Tab X C A Q 2 Fri Apr 14 10:00 PM Periodic Tab x | + ** O Sabrina V alo 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Pivacy Center | Accessibility SU 989arrow_forwardChrome File Edit View History Bookmarks Profiles Tab Window Help I Watch Gilmore Girls | Ne x x A ALEKS - David Teague - xA ALEKS - Reyna Garcia - x 1 9,61 C i www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-IVDWKW_BBZZI6tTytly4Fcfu6zOtof80MM9sGfAPlz6IggLxsfCPjPf Spotify Web Playe. M Common Ethical D. Objective Knowledge Check Question 1 Calculate the mass of forsterite (Mg, SiO,) that contains a trillion (1.00 × 10'“) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits. I Don't Know Submit O 2022 McGraw Hill LLC. All Rights F APR 22 80 888 000 F1 F2 DII F3 F4 F6 F7 FB 23 2$ & 3 4. 7 8 < COarrow_forwardChrome Edit View History Bookmarks Profiles Tab Window Help File (5 unread) - dt x ALEKS ALEKS - David A ALEKS - Re- Watch Gilmore A www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IvdWKW_BBZZ16tTytly4Fcfu6zOtOf8oM Spotify Web Playe.. M common Ethical D. O CHEMICAL REACTIONS Interconverting number of atoms and mass of compound Calculate the number of hydrogen atoms in a 50.0 g sample of ammonia (NH,. Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits. x10 Explanation Check APR 18 ...arrow_forward
- M Gmail T (19) Hira Khan Got Emotion X ALEKS - Rafia Riaz - Knowle X G A small part of a crystal latti X C A small part of a crystal latti X www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-lvdw7xgLCkqMfg8yaFKbD9GafJstkYLIJnusw-UPvlc49wZ0Y-C-Aa6JgU79qspYVPxe6nZcLGhglo61yWvnvbFEk1B_vMo?10Bw7QY... ☆ YouTube Maps Translate Module Knowledge Check News Acetic acid and water react to form hydronium cation and acetate anion, like this: HCH,CO,(aq)+H,O() → H_O* (aq)+CH,CO,(aq) What is the rate of the forward reaction before any HCH3CO2 has been removed from the flask? What is the rate of the forward reaction just after the HCH3CO₂ has been removed from the flask? What is the rate of the forward reaction when the system has again reached equilibrium? I Don't Know How much less HCH3CO₂ is in the flask when the system has again reached equilibrium? Type here to search Imagine 86. mmol of HCH3CO₂ are removed from a flask containing a mixture of HCH₂CO₂, H₂O, H₂O¹ and CH3CO₂ at equilibrium,…arrow_forwardе File Edit View History Bookmarks Profiles Tab Window Help Watch Gilmore Girls | Ne X O ALEKS A ALEKS - David Teague - x A ALEKS - RE A www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IvdWKW_BBZZI6tTytly4Fcfu6zOtOf80M Spotify Web Playe... M Common Ethical D... Objective Knowledge Check Question 7 What is the hybridization of the central atom in the sulfur tetrafluoride (SF.) molecule? I Don't Know Submit O 2022 APR 22arrow_forwardme 2 esc Edit File View ||| ! ALEKS History ALEKS - Tiffany Te-L-Peng - L X C www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-liGBdp5ulp5VqUnMDyPOVaX6q0CRPLZSQ5NDSL9PhmOKLh4C F Explanation @ Bookmarks Profiles O SUBSTITUTION REACTIONS Predicting the effect of carbocation stability on the rate of... Substrate A CI Br For each pair of substrates below, choose the one that will react faster in a substitution reaction, assuming that: 1. the rate law for the substitution reaction has a first-order dependence on the concentration of the alkyl halide, and 2. doesn't depend on the concentration of the other reactant at all. Br Tab X Check Window Help Substrate B CI + Br Faster Rate (Choose one) (Choose one) (Choose one) MacBook Pro G Search or type URL ▼ X Ⓒ2022 McGraw Hill LLC. All Rights Researrow_forward
- *CO 11 of 16 (> Review Constants | Periodic Table Part A HN-HO-HƆ Spell out the full name of the compound. Submit Request Answer Part B H. N. Spell out the full name of the compound. P Pearson Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy Permissions | Contact Us / 12:14 AM xp ジ 10/29/2020 Delete LEGO Backspace 6.arrow_forwardFile Edit View History Bookmarks Profiles A ALEKS-LX Auerbach x Mall-La X Untitled dx A ALEKS-L X www-awu.aleks.com/alekscgi/x/lsl.exe/10_u-IgNslkr7j8P3jH-lvTqeviKFP6W0cqJcWJdIACROQwyw24GWHIn6wmDXTUN80MO03t0lVprAPxlkn.. ity and... 18.3 Gibbs Free E... 5.3 Enthalpies of... 18.5 Gibbs Free E... Reading Schedule 19.6 Reduction Po...Ya SOLUTION: The le... O KINETICS AND EQUILIBRIUM Calculating an equilibrium constant from a heterogeneous... Nickel carbonyl decomposes to form nickel and carbon monoxide, like this: Ni (CO) (9) Ni(s)+4 CO(g) ! 1 stion compound amount Ni (CO)4 0.115 g K = 0 Calculate the value of the equilibrium constant K for this reaction. Round your answer to 2 significant digits. Explanation Q A all Ni CO At a certain temperature, a chemist finds that a 3.5 L reaction vessel containing a mixture of nickel carbonyl, nickel, and carbon monoxide at equilibrium has the following composition: C N 17.954 CO 2 B 34.1 g 1.46 g W comm S Check X X #3 E D 0.9 10 Tab Window Help 4 C X…arrow_forwardmarks People Tab Window Help * 令 100% 47 linois State University : CHE 1 X * MindTap - Cengage Learning G so3 molecular geometry - Goo X i/evo/index.html?deploymentld355750828934189288909969212&elSBN=9781305657571&snapshotld=2199898&id=1.. MINDTAP nd Quick Prep Use the References to access important values if needed for this question. Orbitals which result from solving the Schrodinger Wave Equation can be represented by electron "cloud" pictures. The shapes of the orbitals are distinguished by their nodes, places where the electron density equals zero. Erwin Schrödinger Based upon the number of spherical and angular nodes, label the orbitals below as 1s, 2p, etc. Specify the value of n and I for each: This is a orbital This is a orbital This is a orbital n = and I= n = and / n and I Submit Answer 5 question attempts remainingarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY