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  4. The empirical formula of an organic compound containing carbon and hydrogen is CH2. The mass of one litre of this organic gas is exactly equal to that of one litre of N2. Therefore, the molecular formula of the organic gas is

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Q. The empirical formula of an organic compound containing carbon and hydrogen is $CH_2$. The mass of one litre of this organic gas is exactly equal to that of one litre of $N_2$. Therefore, the molecular formula of the organic gas is

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Solution:

Mass of 1 L of gas = mass of 1 L of $N_2$ according to Avogadro’s hypothesis.
Molecular masses will also be equal, then molecular mass of the $gas = 28$. Hence formula is $C_2H_4 (2 × 12 + 4 × 1 = 28)$.