The Molar Mass of a chemical compound is defined as the mass of that compound divided by the amount of substance in that sample, measured in moles. And is denoted by M. Molar Mass of a chemical compound is usually measured using the Kilogram Per Mole for Molar Mass. Note that the value of Molar Mass of a chemical compound is always positive. Typically, the value of Molar Mass of a chemical compound is greater than 0.