Расставьте коэффициенты,преобразовав схемы в уравнения реакций:
а)Zn+FeCl₃→Fe+ZnCl₂ б)Fe₂O₃+H₂→H₂O+Fe
в)NaNO₃→NaNO₂+O₂ г)Na₂O+P₂O₅→Na₃PO₄
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