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2. Consider two liquids that are mixed together, A and B. When they are mixed together, a plot of vapor pressure versus mixture composition shows a positive deviation from Raoultâs law. What does this tell us about the two liquids, as well as the intermolecular forces at play in the system?

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The liquid phase activity coefficients of the ethanol(1)+toluene (2) system at 55 C are given by the two-parameter Margules equation, where A12=1.869 and A21=1.654.
(a) Show that the pure saturation fugacity coefficient is approximately 1 for both components.

(b) Calculate the fugacity for each component in the liquid mixture at x1=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0. Summarize your results in a table. Plot the fugacities for both components versus x1. Label your curves. For each curve, indicate the regions that may be approximated by Henryâs law and the ideal solution model.

(c) Using the results in part (b), estimate the total pressure above the liquid mixture at 55 C when a vapor phase coexists. Assume the gas phase is ideal for this calculation. Also estimate the vapor composition.
(d) Comment on the validity of the ideal gas assumption used in part (c).

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2. Consider two liquids that are mixed together, A and B. When they are mixed together, a plot of vapor pressure versus mixture composition shows a positive deviation from Raoultâs law. What does this tell us about the two liquids, as well as the intermolecular forces at play in the system?

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2. Consider two liquids that are mixed together, A and B. When they are mixed together, a plot of vapor pressure versus mixture composition shows a positive deviation from Raoultâs law. What does this tell us about the two liquids, as well as the intermolecular forces at play in the system?

Unlock all answers

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related questions

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2. Consider two liquids that are mixed together, A and B. When they are mixed together, a plot of vapor pressure versus mixture composition shows a positive deviation from Raoultâs law. What does this tell us about the two liquids, as well as the intermolecular forces at play in the system?