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19 July, 17:06

The average bond energy (enthalpy) for a C=C double bond is 614 kJ/mol and that of a C-C single bond is 348 kJ/mol. Estimate the energy needed to break only the π bond of the double bond of 2-butene. Express your answer numerically in joules per molecule.

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  1. 19 July, 20:48
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    4.42x10⁻¹⁹ J/molecule

    Explanation:

    At a double bond, there's sigma and a pi bond, and at a single bond, there's only a sigma bond. Thus, if the energy to break both sigma and pi is 614 kJ/mol, and the energy to break only the sigma bond is 348 kJ/mol, the energy to break only the pi bond is:

    E = 614 - 348 = 266 kJ/mol

    Knowing that 1 kJ = 1000 J, E = 266,000 J/mol

    By Avogadro's number, 1 mol = 6.02x10²³ molecules, thus:

    E = 266,000 J/mol * 1mol/6.02x10²³ molecules

    E = 4.42x10⁻¹⁹ J/molecule
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