Pressure over an ideal binary liquid solution containing 10 moles each of liquid A and B is gradually decreased isothermally. At what pressure will half of the total amount of liquid get converted int

Question

Pressure over an ideal binary liquid solution containing 10 moles each of liquid A and B is gradually decreased isothermally. At what pressure will half of the total amount of liquid get converted into vapour? (P_A° = 200 torr, P_B° = 100 torr)

Prashant Kotian · Accepted Answer

Correct answer: D. At 50% vaporisation with equal moles, by mass balance: x_A + y_A = 1.0. Substituting y_A = x_A × P_A°/P, solving: x_A = √2 − 1 ≈ 0.414. P = 100 × 0.414 + 100 = 141.4 torr.

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