Answer
21.36 grams of SO3 is produced.
Work Step by Step
How many grams of SO3 are produced when 20.0 g FeS2 reacts with 16.0 g O2 according to this balanced equation?
4FeS2(S) + 15O2(g) --> 2Fe2O3(S) + 8S03(g)
0.267 mol SO3 (80gram / 1mol SO3)= 21.36 grams of SO3 is produced.