Chalcopyrite (FeCuS2) is oxidized with pure oxygen according to the following reaction. 2FeCuS2+XO2=Cu2S+2FeO+3SO2 Per kmol of Cu2S produced, X kmol of oxygen (O2) are required. a) 1 b) 2 c) 3 d) 4 e) 5 f) 6