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molecular mass is the mass of a given molecule. It is measured in daltons. Different molecules of same compound may have different molecular masses because they contain different isotopes of an element
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The molecular mass of a substance( element or compound) is the number of times the molecule of the substance is heavier than 1 /12th the mass if an atom of Carbon -12
Or
Molecular mass is equal to the sum of the atomic masses of all the atoms present in one molecule of the substance.
For example:-
Molecule mass of H2SO4 = Mass of 2 'H' atoms + Mass of 'S' atoms + Mass of 4 'I'll atoms
= 2×(1) +32 + 4(16) = 2+32+64= 98u
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