Question 4
Gas LawsOne mole of propane is mixed with five moles of oxygen. The mixture is ignited and the propane burns completely. What is the volume of the products at s.t.p? [G.M.V = 22.4 dm3 mol−1]
- A.112.0 dm3
- B.67.2 dm3
- C.56.0 dm3
- D.44.8 dm3.
Show the answer and explanation
Answer: B (67.2 dm3)
Explanation
C3H8 + 5O2 → 3CO2 + 4H2O. At s.t.p. the water is liquid, so only 3 mol of CO2 is gas: 3 × 22.4 = 67.2 dm3.