Define molecular mass of a substance . Find the relative molecular mass
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Relative molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the relative atomic masses of each constituent element multiplied by the number of atoms of that element in the molecular formula.
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molecular mass of a substance ( element or compound ) is the average relative mass of its molecules as compared with that of C - 12 isotope taken as 12 . in other words, molecular mass of a substance represents the number of times the molecule of that substance is heavier than 1/12 th of the mass of an atom of C - 12 isotope.
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