G2 Gas Fitter Practice Exam

What is the standard combustion product in fully burned propane?

1. Carbon dioxide

2. Hydrogen

3. Methane

4. Trace elements

The correct answer is: Carbon dioxide

The standard combustion product of fully burned propane is carbon dioxide. When propane (C3H8) undergoes complete combustion, it reacts with oxygen to produce carbon dioxide (CO2) and water (H2O). This reaction is a key concept in understanding fuel combustion, as it signifies that propane is being used efficiently in an ideal scenario, maximizing energy output while minimizing harmful emissions. In contrast, hydrogen is not a direct product of combusting propane fully; rather, it may be present in trace amounts as a component of fuel, but not as a combustion end product. Methane is a different hydrocarbon altogether and is not produced from the combustion of propane. Lastly, while trace elements may appear in combustion processes with certain fuels, they do not represent the standard products of fully burned propane. Thus, the correct identification of carbon dioxide as the primary product reflects an understanding of the combustion process and the importance of operating gas appliances efficiently and safely.