What is the molarity of a solution prepared by dissolving 20.0 grams of naoh in sufficient water to make a solution with a total volume of 2.40 liters?
a. 0.120 m naoh
b. 0.208 m naoh
c. 0.416 m naoh
d. 0.833 m naoh

B. 0.208 M NaOH

Explanation:

Molarity is the number of moles of solute dissolved in 1 L of solution

we can use the following equation to find the molarity

molarity = number of moles of solute / volume of solution s

number of moles of NaOH dissolved - 20.0 g / 40 g/mol = 0.5 mol

volume of the solution = 2.40 L

substituting the values in the above equation

molarity = 0.5 mol / 2.40 L

molarity = 0.208 M

molarity of NaOH solution is

B. 0.208 M NaOH