The total internal energy of one mole of rigid diatomic gas is\

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Professor PC Thomas Classes · Answer

A rigid diatomic molecule has 5 degrees of freedom: 3 translational and 2 rotational.\ According to the law of equipartition of energy, the total internal energy of one mole of rigid diatomic gas is\ $\mathrm{U}=\frac{5}{2} \mathrm{k}_{\mathrm{B}} \mathrm{T} 	imes \mathrm{N}_{\mathrm{A}}=\frac{5}{4} \mathrm{RT}\left(\because \mathrm{R}=\mathrm{k}_{\mathrm{B}} \mathrm{N}_{\mathrm{A}}ight)$\