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Byju's Answer
Standard XII
Chemistry
Entropy
The units of ...
Question
The units of entropy are
A
J mol
−
1
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B
J K
−
1
mol
−
1
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C
J g
−
1
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D
J K mol
−
1
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Solution
The correct option is
B
J K
−
1
mol
−
1
T
Δ
S
has dimensions of energy per mole (J/Mol)
∴
Δ
S
has dimension of J mol
−
1
K
−
1
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2
Similar questions
Q.
The entropy
(
S
o
)
of the following substances are:
C
H
4
(
g
)
=
186.2
J
K
−
1
m
o
l
−
1
O
2
(
g
)
=
205.0
J
K
−
1
m
o
l
−
1
C
O
2
(
g
)
=
213.6
J
K
−
1
m
o
l
−
1
H
2
O
(
l
)
=
69.9
J
K
−
1
m
o
l
−
1
The entropy change
(
Δ
S
o
)
for the reaction
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
is:
Q.
Calculate the entropy change for the following reaction,
H
2
(
g
)
+
C
l
2
(
g
)
⟶
2
H
C
l
(
g
)
at
298
K
. Given that,
S
⊖
H
2
=
131
J
K
−
1
m
o
l
−
1
,
S
⊖
C
l
2
=
223
J
K
−
1
m
o
l
−
1
and
S
⊖
H
C
l
=
187
J
K
−
1
m
o
l
−
1
.
Q.
The enthalpy of vaporization of water at
100
∘
C
is
40.63
kJ mol
−
1
. Its entropy of vaporization would be:
Q.
For a reaction:
X
→
Y
+
Z
The absolute entropies for
X
,
Y
and
Z
are
120
J
K
−
1
m
o
l
−
1
,
213.8
J
K
−
1
m
o
l
−
1
a
n
d
197.9
J
K
−
1
m
o
l
−
1
respectively.
What will be the entropy change of the reaction at 298 K and 1 atm?
Q.
At 373 K, steam and water are in equilibrium and
△
v
a
p
H
=
40.98
k
J
m
o
l
−
1
.
What will be entropy change for conversion of water into steam?
H
2
O
(
l
)
→
H
2
O
(
g
)
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