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You need oxygen (O2) and some source of fuel. That source of fuel is usually, but not always, a hydrocarbon. For example the combustion of propane would be CH3CH2CH3 + O2 =>3CO2 + 4H2O.
The complete combustion of a hydrocarbon will always result in CO2 and H2O.

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Q: What are the elements needed in the combustion reaction?
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