Decane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, decane burns to form water and carbon dioxide.
2C10H22 + 31O2 → 20CO2 + 22H2O
When not enough oxygen is present for complete combustion, decane burns to form water and carbon monoxide.
2C10H22 + 21O2 → 20CO + 22H2O