Which of the solutions shown here will have the lowest vapor pressure? White circles indicate solvent molecules; black circles indicate molecules of a nonvolatile solute.

Question

Quizplus · Accepted Answer

The solution with the lowest vapor pressure is the one with the highest concentration of nonvolatile solute. In this case, solution D has the most nonvolatile solute molecules, as indicated by the larger number of black circles. The presence of nonvolatile solute molecules reduces the number of solvent molecules at the surface and thus reduces the tendency for the solvent to evaporate.

Which of the Solutions Shown Here Will Have the Lowest