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Dalton's Law of Partial Pressures

A 10 L flas...

Question

A $10 L$ flask contains a gaseous mixture of $C O$ and $C O_{2}$ at a total pressure of $2 a t m$ and $298 K$ . If $0.20 m o l e$ of $C O$ is present, find its partial pressure.

A

0.49 a t m

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B

1.51 a t m

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C

1 a t m

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D

2 a t m

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Solution

The correct option is A $0.49 a t m$
Here, $V = 10 L$ , $n = 0.20 m o l e$ , and $T = 298 K$
By Ideal gas equation
$P V = n R T$
$∴ P = \frac{n R T}{V} = \frac{0.20 \times 0.0821 \times 298}{10} = 0.49 a t m$ .

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