Q. What volume of oxygen gas (O₂) measured at 0°C and 1 atm, is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions?
A) 10 L
B) 7 L
C) 6 L
D) 5 L
Explanation
[Solution from source] C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. At the same temperature and pressure, volumes are in the same ratio as moles, so 1 L of propane needs 5 L of O₂. 7 L comes from adding the volumes of the products, which is not what the question asks. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.