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The molar mass (abbreviated M) is a physical property defined as the mass of a given substance (chemical element or compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol, though g/mol is more commonly used.
Molar masses of elements
The molar mass of atoms of an element is given by the standard atomic weight of the element multiplied by the molar mass constant.
Molar masses of compounds
The molar mass of a compound is given by the sum of the standard atomic weight (namely, the standard relative atomic mass) of the atoms which form the compound multiplied by the molar mass constant.