`4.0 g` of `NaOH` is contained in one decilitre of aqueous solution. Calculate the following in the solution (d of `NaOH` solution `= 1.038 g mL^(-1)`)
a. Mole fraction of `NaOH`
b. Molartiy of `NaOH`
c. Molality of `NaOH`

Explanation

To solve the question step by step, we will calculate the mole fraction, molarity, and molality of the NaOH solution.

### Given Data:
- Mass of NaOH = 4.0 g
- Volume of solution = 1 deciliter (1 dL = 100 mL)
- Density of NaOH solution = 1.038 g/mL

### Step 1: Calculate Moles of NaOH
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