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Sự khử

        $\underset{0,1\,mol}{\mathop{Fe}}\,\,\,\underset{\to }{\mathop{\to }}\,F{{e}^{2+}}+\underset{0,2\,mol}{\mathop{2e}}\,$

         $\underset{a\,mol}{\mathop{Cu}}\,\underset{\to }{\mathop{\to }}\,C{{u}^{2+}}+\underset{2a}{\mathop{2e}}\,$

      $\underset{1,6\,mol}{\mathop{4{{H}^{+}}}}\,+\underset{0,8\,mol}{\mathop{N{{O}_{3}}^{-}}}\,\underset{\to }{\mathop{+}}\,\,\,\,\underset{1,2\,mol}{\mathop{\,3e}}\,\to \underset{0,4\,mol}{\mathop{NO}}\,+2{{H}_{2}}O$