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04-03-2018
Chemistry

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An internal combustion engine relies primarily on the efficient production of energy by the combination of oxygen (02) and gasoline (assume this is primarily octane, C8H18). Write the chemical equation for this reaction and derive the exact ratio of oxygen to octane for 100% efficiency.

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Dejanras Dejanras

14-03-2018

Answer is: the exact ratio of oxygen to octane for is 12.5 : 1.
Balanced chemical reaction: C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O or multiply by 2:
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O.
There same number of atoms on both side of balanced chemical reaction: eight carbon atoms, eighteen hydrogen atoms and twenty five oxygen atoms.

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