What is the mole fraction of benzene, C6H6, in the vapor phase from a solution consisting of a mixture of benzene and toluene, C6H5CH3, at 81.00 °C, if the total pressure above the solution is 458.4 torr? The vapor pressures of pure benzene and NaN at 81.00 °C are 768.0 torr and 283.0 torr, respectively.

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Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter10: Solutions

Section: Chapter Questions

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What is the mole fraction of benzene, C₆H₆, in the vapor phase from a solution consisting of a mixture of benzene and toluene, C₆H₅CH₃, at 81.00 °C, if the total pressure above the solution is 458.4 torr? The vapor pressures of pure benzene and NaN at 81.00 °C are 768.0 torr and 283.0 torr, respectively.

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Step 1

vapour pressure of benzene = 768 torr

vapour pressure of toluene = 283 torr

Mole fraction of benzene=X_B

Mole fraction of benzene=X_T

$X_{B} + X_{T} = 1 T h e r e f o r e, X_{T} = 1 - X_{B}$

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