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What is relative atomic mass?

It is the average mass of an atom of that element as compared to 1/12 of the mass of a carbon atom.

What is relative molecular mass ?

It is the average mass of one molecule of that substance as compared to 1/12 of the mass of carbon atoms.

What is relative formula mass ?

It is the average mass of one unit of that compound relative to 1/12 the mass of an atom of carbon-12.