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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ig165

$100 mL$ of a gas is collected over water at $300 K$ when the total pressure is $760 mm Hg$ and the aqueous tension is $30 mm Hg$ . Which statements are correct?

AThe partial pressure of the dry gas is $730 mm Hg$
BThe volume of the dry gas at $760 mm Hg$ and $300 K$ is about $96 mL$
CThe volume of the dry gas at STP ( $273 K$ , $760 mm Hg$ ) is about $87 mL$
DWater vapour makes up about $3.9%$ of the molecules in the collected gas

Answer: A, B, C, D

p = 760 - 30 = 730

(A).

V = 100 \times 730/760 = 96.1 mL

(B). At STP:

100 \times \frac{730}{760} \times \frac{273}{300} = 87.4 mL

(C).

x_{H X_{2} O} = 30/760 = 0.0395

, about

3.9%

(D). All correct.

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