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Atomic Mass and Atomic Mass Unit

The vapour de...

Question

The vapour density of a gas is $11.2$ . Find the volume occupied by $10 g$ of the gas at STP.

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Solution

$V a p o r D e n s i t y = h a l f o f M o l e c u l a r m a s s$
$∴ M o l e c u l a r M a s s o f g a s = 22.4$
So, Moles of the gas $= \frac{10}{22.4} M o l e s$
Also, since $1$ mole occupies $22.4 L$ at STP.
So, $\frac{10}{22.4} m o l e s$ would occupy $= \frac{10}{22.4} \times 22.4 = 10 L$ at STP.

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