[سيد عثمان]

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Reaction of iron with air

Iron metal reacts in moist air by oxidation to give a hydrated iron oxide. This does not protect the iron surface to further reaction since it flakes off, exposing more iron metal to oxidation. This process is called rusting and is familiar to any car owner. Finely divided iron powder is pyrophoric, making it a fire risk.
On heating with oxygen, O2, the result is formation of the iron oxides Fe2O3 and Fe3O4.
4Fe(s) + 3O2(g) → 2Fe2O3(s)
3Fe(s) + 2O2(g) → Fe3O4(s)