define relative molecular mass
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I guess it is defined as the ratio of the average mass of one molecule of an element to one twelfth of the mass of an atom of carbon-12. is called relative molecular mass.
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Explanation:
Molecular mass definition is - the mass of a molecule that is equal to the sum of the masses of all the atoms contained in the molecule.
The molecular masses of hydrogen, nitrogen, and oxygen are 2, 42, and 32, respectively.
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