4 FeS2 + 11 O2 → 8 SO2 + 2 Fe2O3
This is an oxidation-reduction (redox) reaction:
8 S-I - 40 e- → 8 SIV (oxidation)
4 FeII - 4 e- → 4 FeIII (oxidation)
22 O0 + 44 e- → 22 O-II (reduction)
FeS2 is a reducing agent, FeS2 is a reducing agent, O2 is an oxidizing agent.
Reactants:
- FeS2
- O2
Products:
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride
, Sulphur dioxide
, Sulfurous acid anhydride
- Appearance: Colorless gas
; Colourless gas or compressed liquefied gas with pungent odour
; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
- Other names: Sulfurous anhydride
- Fe2O3 – Iron(III) oxide
- Other names: Ferric oxide
, Hematite
, Ferric iron
- Appearance: Red-brown solid
; Reddish brown-to-black crystals or powder
; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.]
; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]
- Other names: Ferric oxide