4 FeS2 + 9 O2 → 6 SO2 + 2 Fe2SO3
This is an oxidation-reduction (redox) reaction:
2 S-I - 6 e- → 2 SII (oxidation)
6 S-I - 30 e- → 6 SIV (oxidation)
18 O0 + 36 e- → 18 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.]
- Fe2SO3