In the combustion of hydrocarbon, carbon monoxide is formed. What has occurred?
In circumstances where there is insufficient dioxygen gas, incomplete combustion of hydrocarbons to give
Complete combustion of hexanes may be represented by an equation:
If some of the hexanes were incompletely combusted I could write:
Longer chain hydrocarbons (such as diesels) typically burn dirty. How do I know that 1 mole of soot or carbon monoxide were produced in the given equations? Of course, I don't know that, but I know there were SOME products of incomplete combustion, and I modified the complete combustion to represent this. A typical internal combustion engine (or a furnace or a diesel engine) is designed to permit some incomplete combustion.