Definition of relative atomic mass and relative molecular mass
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Relative molecular mass of a substance is the average mass of a molecule of the substance when compared with one twelfth of the mass of one carbon-12 atom. ... Therefore, the relative molecular mass of a substance is calculated by adding up the relative atomic masses of all the atoms present in a molecule of the substance.
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Atomic mass is the mass of the particles contain by an atom
Molecular mass is mass contain by an atom
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