38) Given the following equation: 8 Fe + S: ---> 8 Fes How many g of Fe are needed to react with 256.48 g of sulfur? 39)Given the following equation: Cu + 2 AgNO3 ---> Cu(NO3)2 + 2 Ag How many g of Cu are needed to react with 3.00 moles of AgNO3? 40) Given the following equation: 2 K+ Cl ---> 2 KCI How many g of K are needed to react with 35.45 g of Cl? 4 3 How many g of Fe are needed to react with 32.00 g of O2? 42) 2 Zn + O2-2 Zno How many g of zinc are needed to make 488.28 g of zinc oxide