Final answer:
The expected major final product of the reaction between one methane molecule and two oxygen molecules is carbon dioxide.
Step-by-step explanation:
The question involves determining the major final product of a chemical reaction sequence involving methane and oxygen. When methane reacts with oxygen, the products formed are carbon dioxide and water as part of a combustion reaction. The chemical equation for this reaction is CH4 + 2O2 → CO2 + 2H2O. The combustion of any hydrocarbon with oxygen typically results in carbon dioxide and water. Hence, the expected major final product of the reaction sequence described would be carbon dioxide.