Calculate the molality of a solution containing `20g` of sodium hydroxide `(NaOH)` in `250g` of water ? .

Explanation

To calculate the molality of a solution containing 20g of sodium hydroxide (NaOH) in 250g of water, we will follow these steps:

### Step 1: Calculate the number of moles of NaOH
To find the number of moles of sodium hydroxide, we use the formula:

\[ \text{Number of moles} = \frac{\text{mass of solute (g)}}{\text{molar mass of solute (g/mol)}} \]
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