A solution at 20°C is composed of 1.5 mol of benzene and 3.5 mol

Question:

A solution at $20^{\circ} \mathrm{C}$ is composed of $1.5 \mathrm{~mol}$ of benzene and $3.5 \mathrm{~mol}$ of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are $74.7$ torr and $22.3$ torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively :

 

  1. 38.0 torr and 0.589

  2. 30.5 torr and 0.389

  3. 35.8 torr and 0.280

  4. 35.0 torr and 0.480


Correct Option: 1

Solution:

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