A 25.0-mL sample of sodium sulfate solution was analyzed by adding an excess of barium chloride solution

Question:

A 25.0-mL sample of sodium sulfate solution was analyzed by adding an excess of barium chloride solution to produce barium sulfate crystals, which were filtered from the solution.
Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)
If 5.719 g of barium sulfate was obtained, what was the molarity of the original Na2SO4 solution?