b) Pyrites is roasted in producing SO2. The gases leaving the roaster have a (10 temperature of 500'C with composition SO2 - 9%, O2- 8.6%, and N2 - 82.4%. Composition of pyrites by weight is Fe- 35%, S-40% and gangue 25%. If 100kg of pyrites roasted, Determine b) Pyrites is roasted in producing SO2. The gases leaving the roaster have a (10 temperature of 500'C with composition SO2 - 9%, O2- 8.6%, and N2 - 82.4%. Composition of pyrites by weight is Fe- 35%, S-40% and gangue 25%. If 100kg of pyrites roasted, Determine