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The molar mass of atoms of an element is given by the Standard atomic weight of the element^[2] 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/mol

M(S) = 32.065(5) × 1 g/mol = 32.065(5) g/mol

M(Cl) = 35.453(2) × 1 g/mol = 35.453(2) g/mol

M(Fe) = 55.845(2) × 1 g/mol = 55.845(2) g/mol.

Molar mass is closely related to the relative molar mass (M_r) of a compound, to the older term formula weight (F.W.), and to the standard atomic masses of its constituent elements. However, it should be distinguished from the molecular mass (also known as molecular weight), which is the mass of one molecule (of any single isotopic composition) and is not directly related to the atomic mass, the mass of one atom (of any single isotope). The dalton, symbol Da, is also sometimes used as a unit of molar mass, especially in biochemistry, with the definition 1 Da = 1 g/mol, despite the fact that it is strictly a unit of mass (1 Da = 1 u = 1.660 538 921(73)×10⁻²⁷ kg).^[3][4]

Gram atomic mass is another term for the mass, in grams, of one mole of atoms of that element. "Gram atom" is a former term for a mole.

Molecular weight (M.W.) is an older term for what is now more correctly called the relative molar mass (M_r).^[5] This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant.^[6]

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• HTML5 Molar Mass Calculator Archived 2017-04-25 at the Wayback Machine. web and mobile application.
• Online Molar Mass Calculator with the uncertainty of M and all the calculations shown
• Molar Mass Calculator Online Molar Mass and Elemental Composition Calculator
• Stoichiometry Add-In for Microsoft Excel Archived 2011-05-11 at the Wayback Machine. for calculation of molecular weights, reaction coefficients and stoichiometry. It includes both average atomic weights and isotopic weights.
• Molar mass: chemistry second-level course.