 Thus, heat capacity per mole is the same for all monoatomic gases (such as the noble gases).More precisely, formula_2712.5 J/K/mol and formula_2821 J/K/mol, where formula_298.31446 J/K/mol is the ideal gas unit (which is the product of Boltzmann conversion constant from kelvin microscopic energy unit to the macroscopic energy unit "joule", and Avogadro’s number).Therefore, the specific heat (per unit of mass, not per mole) of a monoatomic gas will be inversely proportional to its (adimensional) atomic weight formula_30.