Chapter 13, Problem 13.65P

(a)

Interpretation Introduction

Interpretation:

The molality of the solution that contains $174\text{g}$ of $\text{HCl}$ in $757\text{g}$ of ${\text{H}}_2\text{O}$ is to be determined.

Concept introduction:

Molality is the measure of the concentration of solute in the solution. It is the amount of solute that is dissolved in one kilogram of the solvent. It is represented by $\text{m}$ and its unit is moles per kilograms. The solute is the substance that is present in a smaller amount and solvent is the substance that is present in a larger amount.

(b)

Interpretation Introduction

Interpretation:

The molality of the solution that contains $16.5\text{g}$ of naphthalene in $53.3\text{g}$ of benzene is to be determined.

Concept introduction:

Molality is the measure of the concentration of solute in the solution. It is the amount of solute that is dissolved in one kilogram of the solvent. It is represented by $\text{m}$ and its unit is moles per kilograms. The solute is the substance that is present in a smaller amount and solvent is the substance that is present in a larger amount.