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Question
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
Options
A.62.5 mm
B.50 mm
C.30 mm
D.40 mm
Solution
$\frac{1}{P} = \frac{Y_{\text{Benzene}}}{P_{\text{Benzene}}^{o}} + \frac{Y_{\text{Toluene}}}{P_{\text{Toluene}}^{o}} = \frac{0.75}{75} + \frac{0.25}{25}$
$\therefore P = 50\text{ mm}$
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