Relative molecular mass of an element or a compound is the number of times one _____ of the substance is heavier than 1/12 of the mass of an atom of carbon
(Atom/ion/molecule)
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relative molecular mass of an element /compound is the number of times one molecule of a substance is heavier than minus -1 /12 that the mass of an atom of carbon(C12)
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Explanation:
answer:molecule
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