what is meant by molecular mass of substence ?
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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).
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The sum of atomic masses of all atoms in molecules , based on a scale in which the atomic masses of hydrogen , carbon , nitrogen, and oxygen are 1, 12 , 14 , 16 respectively. for example the molecular mass of water , which has 2 atoms of hydrogen and an atom of oxygen is 18 .
( i.e., 2+16 )
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