What is the molarity of the solution formed by mixing 0.20mol of sodium hydroxide with enough water to make 150 ml of solution?

Molarity is defined as the number of moles of solute in 1 L of solution

number of NaOH moles present - 0.20 mol

volume of solution - 150 mL

since molarity is taken as number moles of solute in 1000 mL

if 150 mL contains - 0.20 mol

then 1000 mL should contain - 0.20 / 150 x 1000 = 1.33 mol

therefore molarity is 1.33 M