Final answer:
The formula for the combustion of gaseous butane (C4H10) in pure oxygen gas to form carbon dioxide gas and gaseous water is C4H10(g) + 13O2(g) -> 4CO2(g) + 5H2O(g).
Step-by-step explanation:
The formula for the combustion of gaseous butane (C4H10) in pure oxygen gas to form carbon dioxide gas and gaseous water is:
C4H10(g) + 13O2(g) → 4CO2(g) + 5H2O(g)
This balanced equation shows that one molecule of butane reacts with 13 molecules of oxygen gas to produce 4 molecules of carbon dioxide and 5 molecules of water.