Na2SO4 is dissolved in water to make 450mL of a 0.2250 M solution. What is the molar mass of Na2SO4?

mass Na2SO4 = 14.3816 g

Explanation:

sln Na2SO4:

∴ V = 450 mL

∴ C = 0.2250 mol/L

∴ Mw ≡ 142.04 g/mol ... from literature

⇒ mol Na2SO4 = (0.2250 mol/L) (0.450 L) = 0.10125 mol

⇒ mass Na2SO4 = (0.10125 mol) (142.04 g/mol) = 14.3816 g