Thermite mixtures are used for certain types of welding, and the thermite reaction is highly exothermic. F e 2 O 3 ( g ) + 2 A I 2 O 3 ( s ) → 2 F e ( s ) △ r H ° = − 852 kJ mol -1 1.00 of granular F e 2 O 2 and 2.00 molof AI are mixed at room temperature ( 25 ° C ) , and a reaction is initiated. The liberated heat is retained within the products, whose combined specific heat capacity over a broad temperature range is about 0.8 J g − 1 ° C − 1 (The melting point of iron is 1530 °C.) Show that the quantity of heat liberated is more than sufficient to raise the temperature of the products to the meting point of iron.
Thermite mixtures are used for certain types of welding, and the thermite reaction is highly exothermic. F e 2 O 3 ( g ) + 2 A I 2 O 3 ( s ) → 2 F e ( s ) △ r H ° = − 852 kJ mol -1 1.00 of granular F e 2 O 2 and 2.00 molof AI are mixed at room temperature ( 25 ° C ) , and a reaction is initiated. The liberated heat is retained within the products, whose combined specific heat capacity over a broad temperature range is about 0.8 J g − 1 ° C − 1 (The melting point of iron is 1530 °C.) Show that the quantity of heat liberated is more than sufficient to raise the temperature of the products to the meting point of iron.
Thermite mixtures are used for certain types of welding, and the thermite reaction is highly exothermic.
F
e
2
O
3
(
g
)
+
2
A
I
2
O
3
(
s
)
→
2
F
e
(
s
)
△
r
H
°
=
−
852
kJ mol
-1
1.00 of granular
F
e
2
O
2
and 2.00 molof AI are mixed at room temperature
(
25
°
C
)
, and a reaction is initiated. The liberated heat is retained within the products, whose combined specific heat capacity over a broad temperature range is about
0.8
J g
−
1
°
C
−
1
(The melting point of iron is 1530 °C.) Show that the quantity of heat liberated is more than sufficient to raise the temperature of the products to the meting point of iron.
A solution of iron(II) sulfate was prepared by dissolving 10.00 g of FeSO4•7H2O (FW = 277.9) in water and diluting up to a total volume of 250 mL. The solution was left to stand, exposed to air, and some of the iron(II) ions became oxidized to ron(III) ions. A 25.0 mL sample of this partially oxidized solution required 23.70 mL of 0.0100 M potassium dichromate K2Cr2O7 solution for complete reaction in the presence of dilute sulfuric acid. Calculate the percentage of iron(II) ions that had been oxidized by the air.
One day in lab, while adding a gnarled root to a dark liquid bubbling in an iron cauldron, your friend Carmen (an expert chemist) says this:
"Metal sulfides roasted with oxygen produce the corresponding oxide and sulfur dioxide gas."
Using Carmen's statement, and what you already know about chemistry, predict the products of the following reaction.
Be sure your chemical equation is balanced!
olo
Ag,s (s) → [
+ 0,(8)
2
Ar
NO
O+0
REACTION
The molecular weight of sperm whale myoglobin is 17.8 kDa.17.8 kDa. The myoglobin content of sperm whale muscle is about 80 g · kg−1.80 g · kg−1. In contrast, the myoglobin content of some human muscles is about 8 g · kg−1.8 g · kg−1.
Compare the amounts of O2O2 bound to myoglobin in human muscle and in sperm whale muscle. Assume that the myoglobin is saturated with O2,O2, and that the molecular weights of human and sperm whale myoglobin are the same.
How much O2O2 is bound to myoglobin in human muscle?
How much O2O2 is bound to myoglobin in whale muscle?
The amount of oxygen dissolved in tissue water at 37°C37°C is about 3.5×10−5 M.3.5×10−5 M. What is the ratio of myoglobin‑bound oxygen to dissolved oxygen in the tissue water of sperm whale muscle?
Chapter 7 Solutions
General Chemistry: Principles and Modern Applications (11th Edition)
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Calorimetry Concept, Examples and Thermochemistry | How to Pass Chemistry; Author: Melissa Maribel;https://www.youtube.com/watch?v=nSh29lUGj00;License: Standard YouTube License, CC-BY