What is the relative molecular mass of a compound?

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The relative molecular mass of a compound

The relative molecular mass (R.M.M) of a compound or molecule is the number of time the average mass of ane molecule of it is heavier than one-twelve(1/12) the mass of one atom of carbon-12

CALCULATED BY adding the sum of all the individual atomic masses of ALL the atoms in the formula of the compound or molecule. example

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