Molar mass (Chemistry)

Molar mass, symbol M, is a physical property characteristic of a given substance (chemical element or chemical compound), namely its mass per amount of substance. The base SI unit for mass is the kilogram and that for amount of substance is the mole. Thus, the derived unit for molar mass is kg/mol. However, for both practical and historical reasons, molar masses are almost always quoted in grams per mole (g/mol or g mol⁻¹), especially in chemistry.