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 (C3H,OH), in mole fractions, has a vapor pressure of 81.6 torr at 45°C. The vapor of pure water and pure propanol at 45°C 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.
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 (C3H,OH), in mole fractions, has a vapor pressure of 81.6 torr at 45°C. The vapor of pure water and pure propanol at 45°C 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.
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter11: Solutions And Colloids
Section: Chapter Questions
Problem 65E: The vapor pressure of methanol, CH3OH, is 94 torr at 20 C. The vapor pressure of ethanol, C2H5OH, is...
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