Interpretation:
The vapor pressure (in torr) of cyclohexane above the solution has to be calculated.
Concept Introduction:
Vapor pressure depression: The equilibrium between a liquid and its vapor produces a characteristic vapor pressure for each substance that depends on the temperature. The lowering of the vapor pressure is caused by a lesser ability of the solvent to evaporate, so equilibrium is reached with a smaller concentration of the solvent in the gas phase. The vapor pressure of a solution is expressed using Raoult’s law:
The vapor pressure of the solvent
The vapor pressure depression of the solvent is a colligative property, because it is proportional to the concentration of the solute. Raoult’s law is applicable to dilute solution.
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Chemistry: Principles and Practice
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