P4S3 + 6 O2 → P4O6 + 3 SO2
This is an oxidation-reduction (redox) reaction:
4 P-III - 24 e- → 4 PIII (oxidation)
12 O0 + 24 e- → 12 O-II (reduction)
P4S3 is a reducing agent, O2 is an oxidizing agent.
Reactants:
- P4S3 – Tetraphosphorus trisulfide , Or 3,5,7-trithia-1,2,4,6-tetraphosphatricyclo[2.2.1.02,6]heptane
- O2
Products:
- P4O6
- 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.]