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At 25°c, Vapour Pressure of Pure benzene and pure toluene are 93.4 and 26.9 torr respectively. A solution is prepared by mixing 60g benzene and 40g of toluene. What pressure should be maintained in the flask containing this solution so that it start boiling at 25° C.

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6.93 mm

69.327 mm

0.693mm

693.27 mm

answer is C.

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Detailed Solution

$\begin{array}{l} P = P_{A}^{0} X_{A} + P_{B}^{0} X_{B}; X_{A} = \frac{60}{78} / (\frac{60}{78} + \frac{40}{92}) = 0 .639 \\ \Rightarrow X_{B} = 0 .361 \\ ∴ P = 69 .393 mm \end{array}$

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