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- Dictionaryrelative molecular mass
noun
- 1. the ratio of the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12.
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- Molecular mass
Sum of atomic masses of all atoms in a molecule
The molecular mass is the mass of a given molecule. Units of daltons (Da) are often used. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element. The derived quantity relative molecular mass is the unitless ratio of the mass of a molecule to the atomic mass constant (which is equal to one dalton). Wikipedia
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