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# The vapour pressures of pure benzene and toluene at 40$^{\large\circ}$C are 184.0 torr and 59.0 torr, respectively. Calculate the partial pressures of benzene and toluene, the total vapour pressure of the solution and the mole fraction of benzene in the vapour above the solution that has 0.40 mole fraction of benzene. Assume that the solution is ideal.

0.675
Hence (A) is the correct answer.