Substance A (P° = 145 torr) and B (P° = 212 torr) form a real solution. When you make a solution that has a 4:1 mole ratio of A:B, the resulting vapor pressure of the solution is 173 torr. Does the solution display a negative or positive deviation from Raoult’s Law? What does this tell you about the intermolecular interactions between A and B vs pure A and pure B?

Chemistry: Principles and Practice
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter12: Solutions
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Problem 12.94QE
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Substance A (P° = 145 torr) and B (P° = 212 torr) form a real solution. When you make a solution
that has a 4:1 mole ratio of A:B, the resulting vapor pressure of the solution is 173 torr. Does
the solution display a negative or positive deviation from Raoult’s Law? What does this tell
you about the intermolecular interactions between A and B vs pure A and pure B?

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