即 Fe2O3 + 3CO == 2Fe + 3CO2 3、例：配平H2O + Fe →Fe3O4 + H2 第一步：配平氧原子 4H2O + Fe →Fe3O4 + H2 第二步：配平氢原子、铁原子 4H2O + 3Fe →Fe3O4 + 4H2 第三步：配平后的化学方程式： 4H2O + Fe == Fe3O4 + 4H2 4、例：配平FeS2 + O2 → Fe2O3 + SO2 ...

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