Chapter 13.5, Problem 1PPB

Interpretation Introduction

Interpretation:

The mass of urea is to be calculated with the help of mass of water, and the vapor pressure of water and the solution.

Concept introduction:

According to Raoult’s law, in a binary solution, if $P_1$ is the vapor pressure of the solvent, ${\chi }_1$ is its mole fraction, and $P_{\text{A}}{}^{°}$ is its vapor pressure in pure state, then the relation is given as follows:

$P_1={\chi }_1{P}_1{}^{°}$

$\text{No}\text{. of moles}=\frac{\text{mass}}{\text{molar mass}}$

Mole fraction is defined as the ratio number of moles of a specific solute or substance to the total number of moles present in the solution.

Mathematically, mole fraction of component A can be expressed as follows:

${\chi }_{\text{A}}=\frac{\text{moles of component A}}{\text{Sum of moles of all component}}$