The relative molecular mass of an element or compound, is the number of times the average mass of one molecule of it is heavier than one-twelfth the mass of one atom of carbon-12.
The relative molecular mass of an element, is the sum of the relative atomic masses of all the atoms in one molecule of that substance. It is also referred to as the formula mass, this is a more general term.
Note that the relative molecular mass refers only to the relative mass of a molecule. The formula mass refers not only to the relative mass of a molecule, but also that of an ion, radical, electron or any other specified groups or nuclear particles.
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