If the molecule could be entirely described using classical mechanics, then the theorem of equipartition of energy could be used to predict that each degree of freedom would have an average energy in the amount of ⁠ 1 / 2 ⁠ kT, where k is the Boltzmann constant, and T is the temperature. If the number of degrees of freedom of the molecule is f, then each molecule would be holding, on average, a total energy equal to ⁠ 1 / 2 ⁠ fkT. Then the molar heat capacity (at constant volume) would be