Расставить коэффициенты в схемах реакций:
_Fe+_O2—>_Fe3O4
_Na2O+_H2O—>_NaOH
_CaO+_H3PO4—>Ca3(PO4)2+_H2O
_C2H4+_O2—>CO2+_H2O
_Fe2O3+_HCl—>_FeCl3+_H2O
_Cu(NO3)2—>_CuO+_NO2+_O2
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