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April 23, 2014

Homework Help: Chemistry

Posted by Laffy Taffy on Sunday, March 11, 2012 at 4:14am.

An example of a solution that exhibits a positive deviation from Raoultís Law (total pressure is greater than expected) is a solution of acetone (CH3COCH3) and carbon disulfide (CS2).

a) Draw Lewis structures for these molecules. Explain the deviation from ideal behavior in terms of intermolecular forces.

b) A solution composed of 0.60 mole of acetone and 0.40 mole of carbon disulfide has a vapor pressure of 615 mmHg at 35.2 degrees Celsius. What would the vapor pressure be if the solution behaved ideally? The vapor pressures of the pure solvents at 35.2 degrees Celsius are:
acetone = 349 mmHg and carbon disulfide = 501 mmHg.

c) Again assuming ideal behavior, what would be the composition of the vapor in the vapor phase?

d) For the non-ideal solution, would you expect the heat of solution to be positive or negative?

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