Ответ:
2Zn+O2=2ZnO
2Na+O2=Na2O2
C2H4+2O2=CO2+2H2O
Fe+4H2O=Fe3O4+4H2
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Ответ:
2Zn+O2=2ZnO
2Na+O2=Na2O2
C2H4+2O2=CO2+2H2O
Fe+4H2O=Fe3O4+4H2