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Characteristics of Chemical Equilibrium

At a particul...

Question

At a particular temperature, the vapour pressures of two liquids A and B are 120 mm and 180 mm of mercury respectively. If 2 moles of A and 3 moles of B are mixed to form an ideal solution, the vapour pressure of the solution at the same temperature will be: ( in mm of mercury)

A

156

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B

145

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C

150

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D

108

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Solution

The correct option is A 156
$n_{A} = 2$

$n_{B} = 3$

$X_{A} = \frac{2}{5}$ , $X_{B} = \frac{3}{5}$

$P = X_{A} P_{A} + X_{B} P_{B}$

$= \frac{2}{5} \times 120 + \frac{3}{5} \times 180$

$= 48 + 108$

$= 156 m m H g$

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