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In chemistry, the molar mass, M, is a physical property. It is defined as the mass of a given substance (chemical element or chemical compound) divided by its amount of substance.

The molar mass of atoms of an element is given by the atomic weight of the element multiplied by the molar mass constant, M

u = 1×10−3 kg/mol = 1 g/mol:M(H) = 1.007 97(7) × 1 g/mol = 1.007 97(7) g/molM(S) = 32.065(5) × 1 g/mol = 32.065(5) g/molM(Cl) = 35.453(2) × 1 g/mol = 35.453(2) g/molM(Fe) = 55.845(2) × 1 g/mol = 55.845(2) g/mol.

Multiplying by the molar mass constant ensures that the calculation is dimensionally correct: atomic weights are dimensionless quantities(i.e., pure numbers) whereas molar masses have units (in this case, grams/mole).

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