Chemistry solution

Question

What mass, in grams, of sodium sulfate (Na2SO4) is needed to make 275 g of a 1.5% (m/m) aqueous solution of sodium sulfate?

Answer 1

% (m/m) means grams per 100 g of solution.

In this problem, that would be 1.5 g Na₂SO₄ per 100 g of solution. then...

1.5 g Na₂SO₄ /100 g solution x 275 g solution = 4.125 g Na₂SO₄