A `100g NaOH` solution has `20g NaOH`. Find molality .

Explanation

To find the molality of the NaOH solution, we can follow these steps:

### Step 1: Identify the mass of the solute and solvent
- **Mass of NaOH (solute)** = 20 g
- **Total mass of the solution** = 100 g
- **Mass of the solvent (water)** = Total mass of solution - Mass of NaOH
\[
\text{Mass of solvent} = 100 \text{ g} - 20 \text{ g} = 80 \text{ g}
...