Benzene and toluene form an ideal solution. The vapour pressures of benzene and toluene are 75 mm an

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Benzene and toluene form an ideal solution. The vapour pressures of benzene and toluene are 75 mm and 25 mm, respectively, at 20°C. If the mole fractions of benzene and toluene in vapour are 0.75 and 0.25, respectively, then the vapour pressure of the ideal solution is

Accepted Answer

$\frac{1}{P} = \frac{Y_{	ext{Benzene}}}{P_{	ext{Benzene}}^{o}} + \frac{Y_{	ext{Toluene}}}{P_{	ext{Toluene}}^{o}} = \frac{0.75}{75} + \frac{0.25}{25}$$	herefore P = 50	ext{ mm}$

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