define relative molecular mass and relative atomic mass.
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noun. the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12Symbol: M r Abbreviation: r.m.m. Former name: molecular weight.
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the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12Symbol: M r Abbreviation: r.m.m. Former name: molecular weight.
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