Practice question
Question
A solution of two volatile liquids has vapor pressures of 200 mm Hg and 300 mm Hg for pure components. If the mole fraction of the first is 0.7, what is the total vapor pressure?
Explanation
Mole fraction of second = 1 - 0.7 = 0.3 . Total vapor pressure = 200 × 0.7 + 300 × 0.3 = 140 + 90 = 230 mm Hg .
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