These all are Mathematically exactly same. The only difference is in there units. Some are written with "u" as unit (which stands for unified mass) and rest with "g" (gram)
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Molecular mass = total mass of constituent atoms of a molecule . Formula mass = mass of constituent atoms in the empirica formula of compound. Actual mass = molecular mass x 1.6 x 10^-24 . Atomic mass = relative mass as compared to 1/12 th mass of carbon 12 isotope .
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These all are Mathematically exactly same. The only difference is in there units.
Some are written with "u" as unit (which stands for unified mass) and rest with "g" (gram)
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Formula mass = mass of constituent atoms in the empirica formula of compound.
Actual mass = molecular mass x 1.6 x 10^-24 .
Atomic mass = relative mass as compared to 1/12 th mass of carbon 12 isotope .