Помогите приравнять уравнения: (...) - это значит индекс
FeCl(3) + Fe --- FeCl(2)
Cl(2)O(7) + H(2)O --- HClO(4)
Na(2)O + H(2)O --- NaOH
H(2)O(2) --- H(2)O + O(2)
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