Question

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what is a molecular mass❓❓❓
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Answer 1

Molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the atomic weights of each constituent element multiplied by the number of atoms of that element in the molecular formula. 

Answer 2

molecular mass or atomic masses are same they contain electron and neutron
no of electron only atomic no
no of atoms in electron is equal to no of proton in atoms