Chapter 17, Problem 42E

Interpretation Introduction

Interpretation: The vapor pressure of the solution prepared by adding 164 g of a non-volatile liquid, glycerin $\left({\text{C}}_{\text{3}}{\text{H}}_{\text{8}}{\text{O}}_{\text{3}}\right)$ to 338 mL of water $\left({\text{H}}_{\text{2}}\text{O}\right)$ at $39.8°\text{C}$ needs to be determined. The vapor pressure of water at $39.8°\text{C}$ is $54.74\text{ torr}$ and its density is $\text{0}\text{.992}{\text{g/cm}}^{\text{3}}$ .

Concept introduction: Vapor pressure or an equilibrium vapor pressure of a substance is a pressure exerted by the vapors in thermodynamic equilibrium with its condensed phase (like liquid or solid) at the given temperature in a closed system. It can be calculated as: ${\text{P}}_{\text{soln}}\text{=}{\chi }_{\text{solvent}}\text{×}{\text{P}}_{\text{solvent}}^{\text{0}}$