calculate the theoretical yield of sodium sulphide.?

Question

45.0 g of sodium chloride is reacted with iron ii sulphide. you end up collecting 20.0 g of sodium sulphide. calculate the theoretical yield of sodium sulphide.

2NaCl(aq) + FeS(aq) ------>  Na2S(s) + FeCl2(aq)

Answer 1

Supposing the FeS is in excess:

(45.0 g NaCl) / (58.4430 g NaCl/mol) x (1 mol Na2S / 2 mol NaCl) x

(78.0445 g Na2S/mol) = 30.0 g Na2S in theory