jika gas elpiji diasumsikan hanya mengandung gas C3 H8

C₃H₈ (g) + 5O₂ (g) ⇒ 3CO₂ (g) + 4H₂O (g)
v O₂ = ⁵/₁ . v C₃H₈ = 5 . 10 L = 50 L ⇒ Jawab