The word equation tells you.
C4H10(g) + O2(g) ==> H2O(g) + CO2(g)
What is the unbalanced equation for the combustion reaction of gaseous
C4H10 and gaseous oxygen to form gaseous carbon dioxide and gaseous water?
2 answers
2C4H10 + 13O2 ==> 8CO2 + 10H2O