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molecular mass expresse how may time a molicule of a substance is heavier than 1/2th of the mass of carbon-12
The relative molecular mass of an element or compound is the mass of one molecule of the element or compound compared with the mass of an atom of 6C12 which is arbitrarily assigned as 12.000.

Molecular weights are mere numbers and have no units like atomic weights as these are relative weights. The molecular weight is not the actual weight of the molecule, it is a number which indicates how many times the molecule of a particular substance is heavier than one-twelfth of an atom of 6C12 isotope.


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