We’re being asked to calculate the molality of an aqueous solution that contains 4.6% NaCl by mass.

When calculating for **molality**, we use the following equation:

$\overline{){\mathbf{molality}}{\mathbf{}}{\mathbf{\left(}}{\mathbf{m}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{moles}\mathbf{}\mathbf{solute}}{\mathbf{kg}\mathbf{}\mathbf{solvent}}}$

*Aqueous solution → water is the solvent** Solute → NaCl*

**We will calculate the molality of the solution using the following steps:**

**Step 1:** Determine the **composition** of the solution.**Step 2:** Calculate the **moles of the solute**.**Step 3:** Calculate the **mass of the solvent** (in kg).**Step 4:** Calculate the **molality of the solution**.

**Step 1:** Determine the **composition** of the solution.

An aqueous solution contains 4.6 % NaCl by mass. Calculate the molality of the solution.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Molality concept. You can view video lessons to learn Molality. Or if you need more Molality practice, you can also practice Molality practice problems.