Final answer:
The balanced chemical reaction for the combustion of octane with oxygen to form carbon dioxide and water is 2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g).
Step-by-step explanation:
The balanced chemical reaction for the combustion of octane (C8H18) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is:
2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g)
In this reaction, 2 molecules of octane react with 25 molecules of oxygen to produce 16 molecules of carbon dioxide and 18 molecules of water. All reactants and products are in the gaseous phase.