ThermodynamicsMedium

Question

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

Options

A.positive work is done during expansion of the gas by the external pressure
B.positive work is done during expasion 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 unit time when volume is kept constant.

Solution

At constant pressure nCPdT = ᐃU+ PdV    [by first law of thermodynamics]
At constant volume nCvᐃT = ᐃU,   
∴    Cp > Cv

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