How many grams of sulfur would be in a 105g sample of Na2SO4?

Answer 1

Molar mass Na₂SO₄ = 142 g/mole

Atomic mass S = 32.0 g/mole

%S by mass = 32.0 g / 142 g (x100%) = 22.5%

mass of S = 105 g x 22.5% = 23.7 g