According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is :-
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According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is :-

G1 Physics · Accepted Answer

A diatomic molecule has 3 translational and 2 rotational degrees of freedom. One vibrational mode contributes 2 more quadratic degrees of freedom. Thus total f = 7 and C(V) = fR/2 = 7R/2.