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Question
Chemistry
18 g of ice is converted into water at 0° C and 1 atm. The entropies of H2O (s) and H2O (l) are 38.2 and 60 J text/mol text K respectively. The enthalpy change for this conversion is
Q. 18 g of ice is converted into water at
0
∘
C
and 1 atm. The entropies of
H
2
O
(
s
)
and
H
2
O
(
l
)
are 38.2 and
60
J
/
m
o
l
K
respectively. The enthalpy change for this conversion is
2181
229
CMC Medical
CMC Medical 2015
Report Error
A
595.14 J/mol
B
- 5951.4 J/mol
C
5951.4 J/mol
D
- 595.14 J/mol
Solution:
At equilibrium
Δ
H
=
T
⋅
Δ
S
H
2
O
(
s
)
H
2
O
(
l
)
Δ
S
=
S
H
2
O
(
l
)
−
S
H
2
O
(
s
)
=
(
60
−
38.2
)
J
/
m
o
l
-
K
=
21.8
J
/
m
o
l
-
K
Δ
H
=
273
×
(
21.8
)
=
5951.4
J
/
m
o
l