Final answer:
The constant volume heat capacity per mole of a monoatomic molecule, according to the equipartition theorem, is (3/2)R, with R being the ideal gas constant.
Step-by-step explanation:
According to the equipartition theorem, the constant volume heat capacity per mole of a monoatomic molecule is proportional to its number of degrees of freedom. Since a monoatomic ideal gas has three translational degrees of freedom, the value for the molar heat capacity at constant volume Cv can be calculated using the expression Cv = (3/2)R, where R is the ideal gas constant (approximately 8.314 J/mol·K).