Definitely way more complicated than just carbon monoxide. But since there already is carbon monoxide, and that one is definitely combustible, I think it might also be an option to just give burning values to existing carbon monoxide gas.
Also, coal is more complicated than just carbon. Speaking of elements it also has hydrogen and oxygen and so on. And it’s because of this hydrogen content that the gas generated when heating coal strongly in the absence of air contains hydrogen compounds including hydrogen and hydrocarbons.
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