The octane present in gasoline burns according to the following equation: 2 C 8 H 18 + 25 O 2 = 16 CO 2 +18 H 2 O If this reaction is to be used to synthesize 1,15 moles of CO 2

Question

how many moles of octane are needed ?

Answer 1

2C₈H₁₈ + 25O₂ ==> 16CO₂ + 18H₂O ... balanced equation

Use dimensional analysis to find moles of octane to produce 1.15 moles CO₂:

1.15 mol CO₂ x 2 mol C₈H₁₈ / 16 mol CO₂ = 0.144 moles C₈H₁₈ needed