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Define molecular mass of a subtance?...

Define molecular mass of a subtance?

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Molecular mass is defined as the algebric sum of atomic masses of elements present in a molecule. It is obtained by multiplying the atomic mass of each element by the number of its atoms and adding them together. For example, molecular mass of `H_(2)O` is `=2xx` atomic mass of `H +` atomic mass of oxygen `=2 xx 1 +16= 18u`
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