Расставьте коэффициенты методом электронного баланса: Al+F2=AlF3, N2+H2=NH3,  FeO+O2=Fe3O4,  Fe+Cl2=FeCl3,  H2O2=H2O+O2,  Ca+O2=CaO,  Na+Cl2=NaCl, BaO+O2=BaO2.   Помогите плиз))
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