understand what combustion is and how to write balance chemical equations for combustion
Combustion is another name for burning something
The reaction is a hydrocarbon plus oxygen equalling water plus carbon dioxide.
Butane is the gas burning when a lighter is ignited (Pixabay License)
Balance the carbon and hydrogen atoms on both sides of the reaction.
Balance the oxygen atoms.
Balance anything else that has become unbalanced
What is Combustion
How to balance combustion reactions