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Composition of Air

Which mixture...

Question

Which mixture is lighter than humid air?

N_{2} + O_{2} + S O_{2}

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N_{2} + O_{2} + C O_{2}

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N_{2} + O_{2} + C_{2} H_{6}

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N_{2} + O_{2} + H e

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Solution

The correct option is B $N_{2} + O_{2} + H e$
Humid air ( $N_{2} + O_{2} + H_{2} O$ ) is lighter than dry air, $(N_{2} + O_{2})$ as its average molar mass is less. Presence of $H e$ in air, $(N_{2} + O_{2})$ gives lower molar mass than humid air. $H e$ has lower mass than $H_{2} O$ .
Therefore, $N_{2} + O_{2} + H e$ is lighter than humid air.

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