The vapor pressure of an aqueous solution is found to be 24.9 mm Hg at 25°C. What is the mole fraction of solute in this solution? The vapor pressure of water is 25.756 mm Hg at 25°C.
A) 0.967
B) 0.0332
C) 1.03
D) 0.0344
E) 0.976

Question

Quizplus · Accepted Answer

The mole fraction of the solute can be found using Raoult's Law: P_solution = X_solvent * P_pure_solvent. Solving for X_solvent gives X_solvent = P_solution / P_pure_solvent = 24.9 / 25.756. The mole fraction of the solute is 1 - X_solvent, which is approximately 0.0332.

The Vapor Pressure of an Aqueous Solution Is Found to Be