From Wikipedia:
Quote:
Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
C3H8 + 5O2 → 3CO2 + 4H2O + heat
When not enough oxygen is present for complete combustion, propane burns to form water and carbon monoxide.
2C3H8 + 7O2 → 6CO + 8H2O + heat
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Non-life-supporting gasses are a byproduct of ALL combustion save a few special cases (like oxygen generating candles used in the space agency)