A mixture of 60.0% ZnS and 40.0% CuS is heated in the air until the sulfides are completely converted to oxides as shown by the following equations .
2 ZnS + 3 O2 --> 2 ZnO + 2 SO2
2 CuS + 3 O2 --> 2 CuO + 2 SO2
how many grams of SO2 are produced form the reaction of 82.5 g of the sulfide mixture?