Two liquids form a solution and release a quantity of heat.How does the pressure above the solution compare to that predicted by Raoult's law?
A)It will be greater.
B)It will be less.
C)It will be the same.
D)It will show positive deviation.
E)None of these.

Question

Quizplus · Accepted Answer

When two liquids form a solution and release heat, it indicates an exothermic process where the intermolecular forces between the molecules of the mixed liquids are stronger than those in the separate liquids. According to Raoult's law, the partial vapor pressure of each component in a solution is directly proportional to its mole fraction. In this case, because the molecules in the solution are more strongly attracted to each other than to their separate components, they are less likely to escape into the vapor phase. This results in a vapor pressure that is lower than what Raoult's law would predict for an ideal solution, where the intermolecular forces before and after mixing are assumed to be unchanged.

Two Liquids Form a Solution and Release a Quantity of Heat.How