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JEE Advanced levelSingle correct optionDifficulty 3 of 3si100

Bromobenzene (M = 157) is steam distilled at a temperature where the vapour pressure of water is $634 mmHg$ and the total pressure is $760 mmHg$ (M of water = 18). The mass of bromobenzene collected along with $10 g$ of water in the distillate is about

A1.99 g
B5.77 g
C17.3 g
D438.9 g

Answer: C

For immiscible liquids

p_{B} = 760 - 634 = 126

mmHg and

m_{B} / m_{W} = (p_{B} M_{B}) / (p_{W} M_{W}) = (126 \times 157) / (634 \times 18) = 1.733

. For

10

g of water,

m_{B} = 17.3

g.

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