posted by Lance .
A mixture of the compounds magnesium oxide and calcium sulfide contains 21.6999 g of magnesium oxide and is 51.3 % by mass magnesium oxide. The compound calcium sulfide is 44.400 % by mass sulfur. Calculate the moles of sulfur in the mixture.
I'm not sure what I did wrong.
21.6999g CaS2 / molar mass of CaS2 = 0.30079 mol
Answer: 0.285246979573 mol.
21.9999/0.513 = total grams mixture
grams mixture x (1.00-0.487) = g CaS
grams CaS/molar mass CaS = mols CaS
mols S = mols CaS.