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A and B are two identical vessels. A contains 15 g ethane at 1 atm and 298 K. The vessel B contains 75g of gas $X_{2}$ at same temperature and pressure. The vapour density of $X_{2}$ is:

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37.5

150

answer is A.

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Detailed Solution

The vapor density is found by the formula,

Molecular mass of ethane = 30 gm

Molecular mass of gas = M

$\frac{15}{30} = \frac{75}{M}$

$\begin{matrix} \Rightarrow M = 150 \\ ∴ V \cdot D = 75 \end{matrix}$

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