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 A9
Given that for a diatomic gas undergoing a reversible process, its pressure is inversely proportional to absolute temperature.
∴P∝1Tor PT= constant or P(PVnR)= constant
∴PV1/2= constant
Hence, the value of γ is 12. Molar heat capacity =C=CV+R1−γ=5R2+R1−12=9R2 ∴x=9