4. Data:
2Ba(
s
) + O
2
(
g
)
→
2BaO(
s
)
Δ
H
° = -1107.0 kJ
Ba(s) + CO
2
(
g
) + ½O
2
(
g
)
→
BaCO
3
(
s
)
Δ
H
° = -822.5 kJ
Given the data above, calculate
Δ
H
° for the reaction below.
Reaction: BaCO
3
(
s
)
→
BaO(
s
) + CO
2
(
g
)
a.
-1929.5 kJ
b.
-1376.0 kJ
c.
-284.5 kJ
d.
269.0 kJ
e.
537 kJ
5. Which of the following is
not
a state function?
a.
Δ
E
b.
Δ
H
c.
q
d.
P
e.
V
6. Two solutions (the system), each of 25.0 mL volume and at 25.0 °C, are mixed in a
beaker. A reaction occurs between them, causing the temperature to drop to 20.0 °C.
After the products have equilibrated with the surroundings, the temperature is again 25.0
°C and the total volume is 50.0 mL. No gases are involved in the reaction. Which one of
the following relationships concerning the change from initial to final states (both at 25.0
°C) is correct?
a.
Δ
E
= 0
b.
Δ
H
= 0
c.
Δ
E
< 0
d.
w
= 0
e.
q
= 0
7. Which one of the following processes is exothermic?
a. H
2
(
l
)
→
H
2
(
g
)
b. CO
2
(
s
)
→
CO
2
(
g
)
c. H
2
O(
g
)
→
H
2
O(
l
)
d. 16CO
2
(
g
) + 18H
2
O(
l
)
→
2C
8
H
18
(
l
) + 25O
2
(
g
)
e. H
2
(
g
)
→
2H(
g
)
8. Predict the signs of
Δ
H°,
Δ
S°, and
Δ
G° for the vaporization of liquid water at 150°C.
a.
Δ
H° > 0,
Δ
S° > 0,
Δ
G° > 0
b.
Δ
H° < 0,
Δ
S° < 0,
Δ
G° < 0
c.
Δ
H° > 0,
Δ
S° < 0,
Δ
G° > 0
d.
Δ
H° > 0,
Δ
S° > 0,
Δ
G° < 0
e.
none of the above
