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b) 2Fe + O2 ----> 2FeO oxido ferroso/ oxido de hierro (II)
4Fe + 3O2 ----> 2Fe2O3 oxido férrico/ oxido de hierro (III)
c) 4Cu + O2 ----> 2Cu2O oxido cuproso/oxido de cobre (I)
2Cu + O2 -----> 2CuO oxido cuprico