The vapour density of a mixture of and is 20. The percentage of by volume in the mixture is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
The vapour density of a mixture of $O_2$ and $O_3$ is 20. The percentage of $O_3$ by volume in the mixture is:
Answer: B
💡 Solution & Explanation
$\text{Average Molar Mass} = 2 \times \text{V.D.} = 40 \text{ g/mol}$. <br>Let mole fraction of $O_3$ be $x$. <br>$48x + 32(1-x) = 40 \Rightarrow 16x = 8 \Rightarrow x = 0.5$. <br>Volume percentage $= 0.5 \times 100 = 50\%$.
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