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Q.

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

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a

156

b

145

c

150

d

108

answer is A.

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Detailed Solution

Vapor pressure of

$solution = P_{A} + P_{B}$

$P_{A} + P_{B} = P_{A}^{o} X_{A} + P_{B}^{O} X_{B}$

$P_{A}^{o} X_{A} + P_{B}^{O} X_{B} = 120 \times \frac{2}{5} = 180 \times \frac{3}{5}$

= 48 + 108

= 156 mm of Hg

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