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Which of the following statements about the molecular mass is correct?

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Molecular formula shows the exact number of different types of atoms present in a molecule

Molecular formula can be obtained from empirical formula if molar mass is known

Percentage composition of a compound can be calculated from its molecular formula

All the statements are correct

answer is D.

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Detailed Solution

Molecular formula(M.F) of a compound tells about the original no. of atoms present in it.

Empirical formula(E.F) gives the simplest ratio of atoms.

M.F = (E.F)_n

where, $n = \frac{molecular weight}{E . F weight}$

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