Question

Based on the oxidation states of the atoms in this reaction, answer the questions. Fe(0) + O2(0) → Fe2(3+)O3(2-) How many electrons does the iron half-reaction lose? How many electrons does the oxygen half-reaction gain?

Answer 1

Half reaction 1: 2Fe° → Fe₂³⁺ + 6e⁻ /×2.
4Fe° → 2Fe₂³⁺ + 12e⁻.
Iron is oxidized from neutral charge (0) to oxidation number +3, one iron lose three electrons, two irons lose six electrons and four irons twelve electrons.
Half reaction 2: 12e⁻ + 3O₂ → 2O₃²⁻ 
Oxygen is reduced from neutral chage to oxidation number -2, one oxygen gain two electrons, six oxygens gain twelve electrons.
Balanced chemical reaction: 4Fe + 3O₂ → 2Fe₂O₃.

Answer 2

Answer:

The iron half-reaction loses 12.

The oxygen half reaction gains 12.

The total number of electrons that are moved in this oxidation-reduction reaction is 12.

Explanation:

Edge 2020