Methane bums in oxygen to yield carbon dioxide and water. The chemical formula for this reaction is #CH_4 + 2O_2 -> CO_2 + 2H_2O#. What is the product, or what are the products, of this reaction?
Clearly, the products of the reaction are
And there is another reaction product; combustion of hydrocarbons leads to the production of heat, that we can use to do work: