Molecular mass is defined as
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Listen to pronunciation. (muh-LEH-kyoo-ler mas) 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.
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sum of atomic mass of atoms in molecule.
Molecular mass of H2O is
(2*atomic mass of H ) +(1*atomic mass of O)
= 2(1)+1(16)= 18g
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