Which of the following gases will have density of $1.8 g L^{- 1} a t 760$ torr pressure and $27^{\circ} C$ ?

O_{2}

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C O_{2}

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N H_{3}

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S O_{2}

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Solution

The correct option is B
$C O_{2}$
$d = 18 g L^{- 1} P = 760 t o r r T = 27^{\circ} C = 27 + 273 = 300 K P = \frac{d R T}{M} R = 6236 t o r r L K^{- 1} m o l^{- 1} 760 = \frac{18 \times 6236 \times 300}{M} M \approx 44 \frac{g}{m o l}$
The gas with molecular mass 44g is $C O_{2}$

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