2 FeS2 + 5 O2 → 2 FeO + 4 SO2
This is an oxidation-reduction (redox) reaction:
4 S-I - 20 e- → 4 SIV (oxidation)
10 O0 + 20 e- → 10 O-II (reduction)
FeS2 is a reducing agent, O2 is an oxidizing agent.
Reactants:
- FeS2
- O2
Products:
- FeO – Iron(II) oxide
- 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.]