Liquid-liquid solutions are considered ideal if their vapor pressures obey Raoult’s law. A liquid-liquid solution composed of 0.54 water and 0.46 propanol (C3H7OH), in mole fractions, has a vapor pressure of 81.6 torr at 45oC. The vapor of pure water and pure propanol at 45oC is 71.9 torr and 74.0 torr, respectively. Determine whether the above water-propanol solution is ideal, non-ideal with a positive deviation, or non-ideal with a negative deviation. Explain. (A) Ideal solution; the observed vapor pressure of 81.6 torr is equal to the calculated vapor pressure. (B) Non-ideal with positive deviation; the observed vapor pressure is higher than calculated. (C) Non-ideal with negative deviation; the calculated vapor pressure is higher than observed. (D) Non-ideal with positive deviation; the calculated vapor pressure is lower than observed.

According to Dalton law of partial pressure the total pressure of solution in container is equal to…

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Liquid-liquid solutions are considered ideal if their vapor pressures obey Raoult’s law. A liquid-liquid solution composed of 0.54 water and 0.46 propanol (C₃H₇OH), in mole fractions, has a vapor pressure of 81.6 torr at 45^oC. The vapor of pure water and pure propanol at 45^oC is 71.9 torr and 74.0 torr, respectively. Determine whether the above water-propanol solution is ideal, non-ideal with a positive deviation, or non-ideal with a negative deviation. Explain.

(A) Ideal solution; the observed vapor pressure of 81.6 torr is equal to the calculated vapor pressure.

(B) Non-ideal with positive deviation; the observed vapor pressure is higher than calculated.

(D) Non-ideal with positive deviation; the calculated vapor pressure is lower than observed.

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