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  4. A compound with empirical formula CH2O has a vapour density of 30. Its molecular formula is

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Q. A compound with empirical formula $CH_2O$ has a vapour density of 30. Its molecular formula is

Organic Chemistry – Some Basic Principles and Techniques

Solution:

Molecular mass $= 2 × V.D. = 2 × 30 = 60$
$n = \frac{Molecular \,mass}{Empirical \,formula\, mass} = \frac{60}{30} = 2$
Molecular formula $= n ×$ empirical formula
$= 2 × CH_{2}O = C_{2}H_{4}O_{2}$