define molecular mass
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The molecular mass is the mass of a given molecule: it is measured in daltons. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.
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The molecular mass (m) is the mass of a given molecule: it is measured in daltons (Da or u). The molar mass is defined as the mass of a given substance divided by the amount of a substance and is expressed in g/mol.
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