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In chemistry, the molar mass M is a pheesical property defined as the mass o a gien substance (chemical element or chemical compoond) dividit bi the amoont o substance.[1] The base SI unit for molar mass is kg/mol. Houever, for historical raisons, molar masses are awmaist always expressed in g/mol.

Molar mass
Common seembols
SI unit kg/mol
Ither units