ANSWER
The molarity of the solution is 0.25M
EXPLANATION
Given that;
The mole of NaOH is 2.5 mol
The volume of the solution is 10.0L
Follow the steps below to find the molarity of the solution
The molarity formula is given below as
[tex]\begin{gathered} \text{ Molarity = }\frac{\text{ number of moles }}{\text{ volume of solution}} \\ \end{gathered}[/tex]Substitute the given data into the above formula
[tex]\begin{gathered} \text{ Molarity = }\frac{\text{ 2.5 }}{\text{ 10.0}} \\ \text{ Molarity = 0.25 M} \end{gathered}[/tex]Therefore, the molarity of the solution is 0.25M