molarity chemistry

Question

A solution of NaOH is made with a molarity of 0.5M and a volume of 3.0L. How many g of NaOH are in the solution?

Answer 1

Since molarity (M) is defined as moles solute / liter solution, we can find the mass from the info given.

0.5 M = 0.5 moles NaOH/liter solution.

0.5 moles NaOH / liter x 3.0 L = = 1.5 moles NaOH

molar mass NaOH = 40 g/mol

1.5 moles NaOH x 40 g/mole = 60 g NaOH are in the solution