what moleculqr weight of mass
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Molecular weight, also called molecular mass, mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12. It is calculated in practice by summing the atomic weights of the atoms making up the substance's molecular formula.
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The mass of 1 mol of substance is designated as molar mass. By definition, the molar mass has the units of grams per mole. In the above example, the standard atomic weight of carbon is 12.011 g/mol, not 12.00 g/mol.
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