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Byju's Answer
Standard VIII
Physics
Units of Heat
Molar heat ca...
Question
Molar heat capacity of water (liquid) in equilibrium with water vapour at constant pressure is:
A
Zero
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B
∞
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C
75.48
J mol
−
1
K
−
1
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D
40.45
J mol
−
1
K
−
1
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Solution
The correct option is
C
75.48
J mol
−
1
K
−
1
Water in equilibrium with ice has a steady temperature of zero degree celcius
Water in liquid state, has a specific heat of exactly 1 calorie per gram
Molar mass of water is
15.999
+
2.016
=
18.015
grams per mole
Therefore, the molar heat capacity of water at zero degree celcius
=
18.015
×
1
c
a
l
o
r
i
e
/
m
o
l
/
k
=
18.015
×
1
×
4.184
J
/
m
o
l
/
k
=
75.48
J
/
m
o
l
/
k
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0
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