Question

Imagine a solution of two liquids in whichthe molecules interact less favorably than they do in theindividual liquids.Will this solution deviate positively from, deviate negativelyfrom, or ideally follow Raoult's law?A. It will deviate positively.B. It will deviate negatively.C. It will be an ideal solution.

Answer 1

Answer: Option (A) is the correct answer.

Explanation:

It is known that according to Raoult's law, the vapor pressure of an ideal solution is dependent on the vapor pressure of each chemical component and the mole fraction of the component present in the solution.

And, total vapor pressure "p" of the solution once the present components in the solution have reached to the equilibrium is as follows.

      $p = p^{o}_{A} x_{A} + p^{o}_{B} x_{B} + .....$

Hence, when in between the molecules cohesive forces are greater than the adhesive forces then,  dissimilarities of polarity or internal pressure will lead both the components to escape out from the solution more easily.

As a result, the vapor pressure will be greater than expected from the Raoult's law, and it will show a positive deviation.

Thus, we can conclude that the given solution will deviate positively.