The Vapor Pressures of Pure Hexane and Pure Heptane at 25

question 123

Multiple Choice

The vapor pressures of pure hexane and pure heptane at 25 °C are 151.4 mmHg and 45.62 mmHg respectively.A solution contains 0.800 mol fraction n-hexane and 0.200 mol fraction n-heptane.What is the composition of the vapor in equilibrium with this solution at 25 °C?

• A)80.0% hexane,20.0% heptane
• B)50.0% hexane,50.0% heptane
• C)77.0% hexane,23.0% heptane
• D)45.0% hexane,55.0% heptane
• E)93.0% hexane,7.0% heptane

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