According to the 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:

  • A
    $\frac{9}{2} R$
  • B
    $\frac{5}{2} R$
  • C
    $\frac{3}{2} R$
  • D
    $\frac{7}{2} R$

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