Combustion Reaction
The rapid exothermic reaction of a substance with oxygen, usually producing heat and light.
Formula / equation
CₓH_y + O₂ → CO₂ + H₂O
Unit
kJ/mol
In depth
Complete combustion of a hydrocarbon gives only carbon dioxide and water, while a limited oxygen supply produces carbon monoxide and soot instead, releasing far less energy and creating a serious poisoning hazard. Combustion supplies most of the world's primary energy.
Examples in the real world
CH₄ + 2O₂ → CO₂ + 2H₂O releasing 890 kJ/mol; incomplete burning giving the yellow, sooty flame of a closed Bunsen valve.