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Molecular mass
Pronunciation
Definition 1
The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively. For example, the molecular mass of water, which has two atoms of hydrogen and one atom of oxygen, is 18 (i.e., 2 + 16). Also called molecular weight. (NCI Dictionary)
Definition 2
The sum of the relative atomic masses of the constituent atoms of a molecule. (NCI Thesaurus)
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