Question

define relative molecular mass

Answer 1

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Relative molecular mass of an element or a compound is the number that represents how many times one molecule of the substance is heavier than 1/12 times of the mass of an atom of carbon-12.

The RMM is obtained by adding together the relative atomic masses of all the various atoms present in a molecule.

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Answer 2

relative molecular mass relative molecular mass of a molecule

is the average mass of one molecule of a substance when when compared with 1/12 of the mass of an atom of carbon-12 OR compared with 1 normal hydrogen atom