Question

1.4 moles of propane react with 16 moles of oxygen gas in a combustion reaction, how many moles of carbon dioxide is formed which is the limiting reagent?

Answer 1

Answer is: 9.6 moles of carbon dioxide is formed and oxygen is limiting reagent.

Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
n(C₃H₈) = 4 mol; a
n(O₂) = 16 mol; limiting reagent.
From balanced chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.
For 4 moles of propane, 20 moles of oxygen is needed.
n(O₂) : n(CO₂) = 5 : 3.
n(CO₂) = 3 · 16 mol ÷ 5.
n(CO₂) = 9.6 mol.