Question

Which two factors determine the vapor pressure of a solution containing a non-volatile solute dissolved in a volatile solvent, at a given temperature?
the molar mass of the solute and the volume of the solution
the vapor pressure of the solute and the concentration of the solvent
the concentration of the solute and the molar mass of the solvent
the vapor pressure of the solvent and the concentration of the (non-volatile) solute particles

Answer 1

Answer: Option (d) is the correct answer.

Explanation:

A volatile solvent will easily change into vapors and therefore, more vapors it will form more will be its vapor pressure.

Whereas a non-volatile solute will not change into vapors easily because it will deposit at the upper surface of the solution due to which solvent particles will not be able to escape into atmosphere. Therefore, they will not generate enough vapors

Hence, a non-volatile solute will lead to decrease in vapor pressure of the solution.

Thus, we can conclude that the vapor pressure of the solvent and the concentration of the (non-volatile) solute particles are the two factors that determine the vapor pressure of a solution containing a non-volatile solute dissolved in a volatile solvent, at a given temperature.

Answer 2

It has to be D. I know the vapor pressure has to do woth the solvent. that is what the pressure is calculated from