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Thermodynamics and Thermochemistry
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Heat capacities and their relations
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td170
For one mole of an ideal gas, the difference
C
P
−
C
V
equals
A
2
3
R
B
2
5
R
C
0
D
R
Answer: D
For an ideal gas
H
=
U
+
RT
, so
d
H
/
d
T
−
d
U
/
d
T
=
R
. Hence
C
P
−
C
V
=
R
per mole (Mayer's relation).
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