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C + O2 --- CO2
S + O2 ---> SO2
A --- węgiel ... C
B --- tlen ... O2
C --- tlenek siarki(IV) ... SO2
2)
2Cu + O2 ---> 2CuO
O2 + 2H2 ---> 2H2O
H2 + CuO ---> H2O + Cu
2H2O ---> 2H2 + O2
A --- tlen ... O2
B --- tlenek miedzi(II) .. CuO
C --- woda ... H2O