Practice question
Question
What is the vapor pressure of a solution made by mixing two volatile liquids with vapor pressures 300 mm Hg and 400 mm Hg, if their mole fractions in the solution are 0.4 and 0.6, respectively?
Explanation
Total vapor pressure = p₁⁰ · x₁ + p₂⁰ · x₂ . 300 × 0.4 + 400 × 0.6 = 120 + 240 = 360 mm Hg .
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