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Question

For a diatomic gas undergoing a reversible process with its pressure inversely proportional to absolute temperature, its molar heat capacity is xR2. The value of x is:

A
9
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B
7
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C
12
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D
8
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Solution

The correct option is A 9
Given that for a diatomic gas undergoing a reversible process, its pressure is inversely proportional to absolute temperature.
P1T or PT= constant or P(PVnR)= constant
PV1/2= constant
Hence, the value of γ is 12.
Molar heat capacity =C=CV+R1γ=5R2+R112 =9R2
x=9
Hence, the value of x is 9.

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