A mixture contains 1 mole of volatile liquid A (P_A° = 100 mm Hg) and 3 moles of volatile liquid B ( — Solutions and Colligative Properties Chemistry Question
Question
A mixture contains 1 mole of volatile liquid A (P_A° = 100 mm Hg) and 3 moles of volatile liquid B (P_B° = 80 mm Hg). If the solution behaves ideally, the total vapour pressure of the distillate is
Answer: B
💡 Solution & Explanation
X_A = 0.25, X_B = 0.75. P_total = 25 + 60 = 85 mm Hg. Y_A = 25/85 = 5/17, Y_B = 12/17. P_distillate = 100 × (5/17) + 80 × (12/17) = 1460/17 ≈ 85.88 mm Hg.
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