Final answer:
No, an equilibrium is not established among CH4, O2, CO2, and H2O when a burner on a gas stove is lit.
Step-by-step explanation:
Under the conditions of a burner on a gas stove, an equilibrium is not established among CH4, O2, CO2, and H2O. This is because in the presence of a continuous source of ignition, methane (CH4) and oxygen (O2) react completely to form carbon dioxide (CO2) and water (H2O), with no reverse reaction occurring.