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Chemistry
Chemistry
Problem
Which of the following phase changes is exothermic for the substance undergoing the change at 1 atm? a)
CO
2
(
s
)
→
CO
2
(
g
)
\text{CO}_2(s) \rightarrow \text{CO}_2(g)
CO
2
(
s
)
→
CO
2
(
g
)
(sublimation) b)
H
2
O
(
g
)
→
H
2
O
(
l
)
\text{H}_2\text{O}(g) \rightarrow \text{H}_2\text{O}(l)
H
2
O
(
g
)
→
H
2
O
(
l
)
(condensation) c)
C
2
H
5
OH
(
l
)
→
C
2
H
5
OH
(
g
)
\text{C}_2\text{H}_5\text{OH}(l) \rightarrow \text{C}_2\text{H}_5\text{OH}(g)
C
2
H
5
OH
(
l
)
→
C
2
H
5
OH
(
g
)
(vaporization) d)
H
2
O
(
s
)
→
H
2
O
(
l
)
\text{H}_2\text{O}(s) \rightarrow \text{H}_2\text{O}(l)
H
2
O
(
s
)
→
H
2
O
(
l
)
(melting)
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