Question

what is actual difference between actual mass of molecule and gram molecular mass

Answer 1

Annyeong friend! :D

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Molecular mass is the mass of 1 molecule and gram molecular mass is the mass of 1 mole molecules (just to keep the numeric value same).

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for example - mass of H2O molecule is 18 AMU (atomic mass unit)

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while mass of 1 mole of water is 18 g . So thus 18 g is also known as water’s gram molecular mass.

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You may note that the numeric value is same.

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Hope this helps, Hyun Tae ^ ^