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14 May, 01:03

Consider the following equation that describes the complete combustion of propane, C3H8. The bond energies are: C H 416 kJ/mol; C C 356 kJ/mol; OO 498 kJ/mol; CO 803 kJ/mol; H O 467 kJ/mol. Which is the amount of energy gained on making all the bonds in carbon dioxide and water according to the equation?

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  1. 14 May, 02:44
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    8,554 kJ/mol

    Explanation:

    The equation of the complete combustion of propane is:

    C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

    The molecule of carbon dioxide is OCO, so there are 2 CO bonds, and the molecule of water is HOH, so there are two H O bonds in the molecule.

    The total bond energy is the sum of the energy of each bond. Because there are 3 moles of CO₂ and 4 moles of H₂O, the energy gained is:

    3*2*803 + 4*2*467 = 8,554 kJ/mol
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