How many grams

Question

How many grams of Na2SO4 are needed to prepare 0.825 L of a 0.450 M solution?

Answer 1

0.450 M = 0.450 moles/liter

0.450 moles/liter x 0.825 liters = 0.37125 moles Na₂SO₄ needed

molar mass Na₂SO₄ = 142 g/mole

0.37125 moles x 142 g/mole = 52.7 grams Na₂SO₄ needed (to 3 significant figures)