Question

How much heat (in kcal) is released when burning one molecule of octane (gasoline, C8H18) completely to carbon dioxide ( CO2) and water (H2O)?​

Answer 1

Answer:

C8H18 + O2 = CO2 + H2O - Chemical Equation Balancer.

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Answer 2

The exothermic reaction of octane complete combustion is 183.55Kcal/mol

Explanation:

• Octane is a straight-chain alkane compound of 8 carbon. The octane release gas on the complete reaction called octane rating.

• Octane rating is the measure of a fuel's ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine.

The balanced complete reaction is

C₈H₁₈ (l) + O₂ → CO₂ (g) + H₂O (g)

The balanced equation is

     C₈H₁₈ (l) + 25/2 O₂ → 8 CO₂ (g) + 9 H₂O (g)

    2                 25         16              18

The gas released while burning one molecule of octane is gasoline,

  = 768 × (12.01 + 4× 100)

  = 183.55  Kcal/mol.