Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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1. calculate the delta Hf in Kj of NH4Cl (s) ussing hess law. write out all reactions.
calculate the % error, accepted value is -314.4 kj/,ol
is it exothermic or endothermic? explain.
Transcribed Image Text:D2L S-23 Enthalpy 2 Lab Packe X D2L S-23 Enthalpy 2 Lab Proce X
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in the laboratory. ThS OVET All TEACTION IS Tepresented by.
rxn 1:
rxn 2:
rxn 3:
rxn 4:
overall rxn:
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Chemistry: An Atoms-Foc X
12 N2 (g) + 2 H2 (g) + 2Cl2 (g) → NH4Cl (s)
where AH is the enthalpy change per mole of solid ammonium chloride formed. However, the formation
of solid ammonium chloride can be considered as occurring in a number of steps, each having an
enthalpy change associated with it:
1/2 N2 (g) + 3/2 H2 (g) → NH3 (aq)
1/2 H2 (g) + 1/2 Cl2 (g) → H*(aq) + Cl(aq)
NH3 (aq) + H+ (aq) + Cl·(aq) → NH4Cl (aq)
NH4Cl (aq) → NH4Cl (s)
1/2 N2 (g) + 2 H2 (g) + ½ Cl2 (g) → NH4CI (S)
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I.
As shown above, there are multiple ways in which the enthalpy of reaction can be determined for a given
Activity Details
81
ammonium chloride - Go X
CLOCKS-HOTEL.xlsx
2.
AH₁ = ?
d
https://cer.uscga.ed...
AH₁ = (from textbook Table A4.3)
AH₂ = (from textbook Table A4.3)
AH3 = (from experiment Part 1)
AH4 = (from experiment Part 2)
AH₁ = (apply Hess's Law)
+
I
PDF PDF to PNG - Conv...
PNG
11:03 PM
2/6/2022
X
![Jame
1 (1 pts) Initial Temperature of solution
2
Calculations! Certain questions will require you to show your work. Any question with an asterix (*) next to the point
value will require work to be shown. Label the work with what number problem you are doing.
3
4
(1 pts) Equation to calculate qwater (dsc'utior
is 1.0267 mL)
13
(1 pts) Final Temperature of solution
5 (3 pts)* Calculate qwater (in J)
6
(1 pts) Equation to determine moles from
molarity and volume
7 (3 pts) * Calculate moles of NH3
8
(1 pts) Equation to calculate AHxn using
moles and qwater
9 (3 pts) * Calculate Axn (in kJ/mol)
(2 pts)* Calculate ATwater
15
13 (1 pts) Initial Temperature of solution
11 (1 pts) Final Temperature of solution
12
(2 pts) * Calculate ATwater
(1 pts) Equation to calculate qwater (dsolution
is 1.0267 g/mL)
Part 1 (16 pts): Neutralization of aqueous ammonia (Atin Hs)
18
14 (3 pts)* Calculate qwater (in J)
16
(2 pts) Mass of NH4CI
17 (2 pts)* Calculate moles of NH4Cl
28 +3
(1 pts) Equation to determine moles from
mass and molar mass
(1 pts) Equation to calculate AHsol using
moles and qwater.
(3 pts) * Calculate AHsol (in kJ/mol)
H-C:
20 (2 pts) AH NH3 (ag) (Appendix Table A4.3)
21 (3 pts) AH, HCI (aq) (Appendix Table A4,3)
(Strong Acid so H+ (aq) + Ct (aq))
6.431
Enthalpy 2
mela
]-[91640) + (9014
apter 6: Energy and
Lab Title
46, 995 kJ/male
Part 2 (17 pts): Dissolution of ammonium chloride (AHsol, AH4)
23.00°C
28-47°C
M = 1
V
5.47°C
серь
q=merot qw = (Uw • disolution) Cs AT
MCSAT
2349.75 J
.05 maler
Анкхи = -ди
w/nR
22-09
14.97
-7.12
quz uw - dvolution) CUST
-3058.55 J
n = moles
n = m/M
m = mass
M = inilar mass
5-345 g
+ Matapb 0.1 male
J
A Hsol = - 9H₂0/ males
Андав
30585.5
Part 3 (5 pts): Hess's Law
80.3 kJ/mal
- 167.2
0.0
kJ / mal
HCl(aq) = -167-2
02
KJ/Ndci- (aq)
kJ mal
kJ / mal 7 H+ (aq) Page 3 of 8
Date
kJ/mal
x = -196 kJ
rxn
VU
KEY QUESTIONS
7. When are AH values equal to zero?
KJ/mol) + (1) (0 kJ/mol)] - [(2)(-18-
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Transcribed Image Text:Jame
1 (1 pts) Initial Temperature of solution
2
Calculations! Certain questions will require you to show your work. Any question with an asterix (*) next to the point
value will require work to be shown. Label the work with what number problem you are doing.
3
4
(1 pts) Equation to calculate qwater (dsc'utior
is 1.0267 mL)
13
(1 pts) Final Temperature of solution
5 (3 pts)* Calculate qwater (in J)
6
(1 pts) Equation to determine moles from
molarity and volume
7 (3 pts) * Calculate moles of NH3
8
(1 pts) Equation to calculate AHxn using
moles and qwater
9 (3 pts) * Calculate Axn (in kJ/mol)
(2 pts)* Calculate ATwater
15
13 (1 pts) Initial Temperature of solution
11 (1 pts) Final Temperature of solution
12
(2 pts) * Calculate ATwater
(1 pts) Equation to calculate qwater (dsolution
is 1.0267 g/mL)
Part 1 (16 pts): Neutralization of aqueous ammonia (Atin Hs)
18
14 (3 pts)* Calculate qwater (in J)
16
(2 pts) Mass of NH4CI
17 (2 pts)* Calculate moles of NH4Cl
28 +3
(1 pts) Equation to determine moles from
mass and molar mass
(1 pts) Equation to calculate AHsol using
moles and qwater.
(3 pts) * Calculate AHsol (in kJ/mol)
H-C:
20 (2 pts) AH NH3 (ag) (Appendix Table A4.3)
21 (3 pts) AH, HCI (aq) (Appendix Table A4,3)
(Strong Acid so H+ (aq) + Ct (aq))
6.431
Enthalpy 2
mela
]-[91640) + (9014
apter 6: Energy and
Lab Title
46, 995 kJ/male
Part 2 (17 pts): Dissolution of ammonium chloride (AHsol, AH4)
23.00°C
28-47°C
M = 1
V
5.47°C
серь
q=merot qw = (Uw • disolution) Cs AT
MCSAT
2349.75 J
.05 maler
Анкхи = -ди
w/nR
22-09
14.97
-7.12
quz uw - dvolution) CUST
-3058.55 J
n = moles
n = m/M
m = mass
M = inilar mass
5-345 g
+ Matapb 0.1 male
J
A Hsol = - 9H₂0/ males
Андав
30585.5
Part 3 (5 pts): Hess's Law
80.3 kJ/mal
- 167.2
0.0
kJ / mal
HCl(aq) = -167-2
02
KJ/Ndci- (aq)
kJ mal
kJ / mal 7 H+ (aq) Page 3 of 8
Date
kJ/mal
x = -196 kJ
rxn
VU
KEY QUESTIONS
7. When are AH values equal to zero?
KJ/mol) + (1) (0 kJ/mol)] - [(2)(-18-
products & read
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