<u>Answer:</u> The molar concentration of NaOH in the final diluted solution is 0.056 M
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:

Given mass of NaOH = 4.00 g
Molar mass of NaOH = 40 g/mol
Volume of solution = 5.00 mL
Putting values in above equation, we get:

To calculate the molarity of the diluted solution, we use the equation:

where,
are the molarity and volume of the concentrated NaOH solution
are the molarity and volume of diluted NaOH solution
We are given:

Putting values in above equation, we get:

Hence, the molar concentration of NaOH in the final diluted solution is 0.056 M