3 ms·

Also, where would you get the Fe from? Seems like you’d substituting Fe for C, but Fe is rarely ever found in free form in nature.

• pfdietz 5y ago
  The Fe (or more generally some element M; many possibilities have been considered) cycles from one oxidation state to another and back again. It is not used up.
  • balsam 5y ago
    Yeah its probably different iron oxides: fe(II) <-> fe(III) and not free iron.