J/mol stands for joules per mole and represents a unit used to express quantities related to energy or enthalpy on a molar basis. It indicates that measurements are being made per mole of substance.
The volume occupied by one mole of any ideal gas at standard temperature and pressure (STP).
Molar Ratio: The ratio of the coefficients of reactants and products in a balanced chemical equation, which indicates the relative number of moles involved in a reaction.