posted by Lance .
A 79.1 g mixture of the compounds calcium chloride and sodium sulfide is 80.9 % by mass sodium sulfide. The compound sodium sulfide is 58.9 % by mass sodium. Calculate the mass (g) of sulfur in the mixture.
g Na2S + g NaCl = 79.1 g.
mass Na2S = 79.1 x 0.809 = ? g.
Then ?g x 0.589 = mass S.