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For an ideal gas, the heat capacity at c...

For an ideal gas, the heat capacity at constant pressure is larger than than that at constant volume because

A

positive work is done during expansion of the gas by the external pressure

B

positive work is done during expansion by the gas against external pressure

C

positive work is done during expansion by the gas against intermolecular forces of attraction

D

more collisions occur per unti time when volume is kept constant.

Text Solution

Verified by Experts

The correct Answer is:
B
At constant pressure `nC_(P)dT = PdV [ by` first law of thermodynamics]
At constant volume `nC_(v)DeltaT = DeltaU`.
`:. C_(P) gt C_(V)`
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