Chapter 13, Problem 20QP

Interpretation Introduction

Interpretation:

The statement molarity is equal to its molality is to be checked for a $0.010\text{ M}$ aqueous urea solution.

Concept introduction:

Molality is the number of moles of solute dissolved in per $\text{kg}$ of solvent.

The expression to calculate molality $\left(m\right)$ is as follows:

$m=\frac{\text{moles of solute}}{\text{mass of solvent}\left(\text{in kg}\right)}$ …… (1)

The relation between moles $\left(n\right)$, mass, and molar mass is as follows:

$n=\frac{\text{mass}}{\text{molar mass}}$ …… (2)

Molarity $\left(M\right)$ is the number of moles of solute present in per liter of solution.

The formula to calculate molarity is as follows:

$M=\frac{\text{moles of solute}}{\text{liters of solution }}$ …… (3)