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Combustion reactions involve hydrogen or a hydrocarbon reacting with oxygen and usually always produce water and carbon dioxide as their products. After you figure out which products make sense from these reactants, you can balance the equation.
If they give you the reactants and not the products and you're told that its undergoing combustion, you can assume that the reactants are oxygen (O2) as well as the other reactant given. The products of combustion are always H2O and CO2, but sometimes other products will be given. From there, you still have to balance the reaction before you can use it to solve problems.
Combustion reactions will always have carbon dioxide (CO2) and water (H20) as its products. Whatever substance is being combusted with will always react with oxygen to be combusted (i.e. O2 will always be a reactant). You can then balance your equation normally.
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