Chapter SM, Problem 22PQ

Interpretation Introduction

Interpretation:

The mass of water that is needed to dissolve $292.5\text{ g}$ of $\text{NaCl}$ to produce $0.25m$ aqueous solution has to be determined.

Concept Introduction:

Molality is a concentration term that is defined as moles or amount of solute divided by mass of solvent in kilograms. It is represented by $m$ and it has units of $\text{mol/kg}$.

The formula to calculate molality of solution is as follows:

  $\text{Molality of solution }\left(m\right)=\frac{\text{Amount}\left(\text{mol}\right)\text{of solute}}{\text{Mass}\left(\text{kg}\right)\text{of solvent}}$        (1)