Ответ учителя по предмету Химия
Смотри, тут все просто. Сравни степени окисления у элементов левой части с правой. Там где они разные записываешь, оставь место для е, ставь стрелочку и пиши элемент со степенью окисления правой части. А число электронов (е) берется исходя из степени окисления. Что не понятно — спрашивай.
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