December 2018 1 24 Report
Redoks
2H2S+3O2 --> 2SO2+2H2O
S(-II) --> S(IV)+6e
O2(0) +?-->2O(-II)
w ZNAK ? najchętniej wstawiłabym 2, ale dlaczego tu musi być 4? ktoś wyjaśni?

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