Chapter 13.6, Problem 13.7AFP

Interpretation Introduction

Interpretation:

The vapor pressure lowering of a solution of $2.00\text{g}$ of aspirin is to be determined.

Concept introduction:

Raoult’s law is a chemical law which states the relationship between vapor pressure and the mole fraction of the solute. It states that the vapor pressure of the solution is equal to the product of the vapor pressure of the pure solvent and the mole fraction of the solvent.

The formula to calculate the vapor pressure lowering is as follows:

$\Delta P=\left(X_{\text{solute}}\right)\left(P_{\text{solvent}}^{°}\right)$ (1)

The mole fraction is calculated as follows:

$\text{Mole}\text{fraction}\left(\text{X}\right)=\frac{\text{amount}\left(\text{mol}\right)\text{of}\text{solute}}{\text{amount}\left(\text{mol}\right)\text{of}\text{solute}+\text{amount}\left(\text{mol}\right)\text{of}\text{solvent}}$ (2)