Understanding Molarity

Molarity (M) is a unit of concentration that represents the number of moles of solute dissolved in 1 liter of solution.

Formula

Molarity (M) = moles of solute / liters of solution

Applying the Information

* Moles of solute (NaOH): 4 mol

* Liters of solution: 2 L (Since we're assuming the volume of the solution is approximately the same as the volume of water)

Calculation

Molarity (M) = 4 mol / 2 L = 2 M

Therefore, the molarity of the solution is 2 M.