Liquids P and Q form an ideal solution. The vapour pressures of pure liquids P and Q at 80°C are 300 mm and 100 mm of Hg, respectively. Suppose that the vapour above a solution composed of 1.0 mole of

Question

Liquids P and Q form an ideal solution. The vapour pressures of pure liquids P and Q at 80°C are 300 mm and 100 mm of Hg, respectively. Suppose that the vapour above a solution composed of 1.0 mole of P and 1.0 mole of Q at 80°C is collected and condensed. This condensate is then heated to 80°C and vapour is again condensed to form a liquid R. What is the mole fraction of P in R?

Prashant Kotian · Accepted Answer

Correct answer: C. 1st distillation: X_P = 0.5, P_total = 200 mm. Y_P = 150/200 = 0.75. 2nd distillation: X_P' = 0.75, P_total' = 250 mm. Y_P' = 225/250 = 0.90. Mole fraction of P in R = 0.90.

💡 Solution & Explanation

Practice 22,000+ questions like this