At 25oC the vapor pressure of pure benzene is 93.9 torr. When a non-volatile solvent is dissolved in benzene, the vapor pressure of benzene is lowered to 91.5 torr. What is the concentration of the solute and the solvent, expressed in mole fraction? Answer: Vapor pressure lowering  ΔP=2.4torr  with  χsolute = 0.026

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Chapter12: Solutions
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Problem 12.94QP: What is the total vapor pressure at 20C of a liquid solution containing 0.30 mole fraction benzene,...
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At 25oC the vapor pressure of pure benzene is 93.9 torr. When a non-volatile solvent is dissolved in benzene, the vapor pressure of benzene is lowered to 91.5 torr. What is the concentration of the solute and the solvent, expressed in mole fraction?

Answer: Vapor pressure lowering  ΔP=2.4torr  with  χsolute = 0.026

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