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Homework Help: Bond Energy & Enthalpy

  1. Oct 20, 2011 #1
    1. The problem statement, all variables and given/known data
    Enthalpies of fumaric and succinic acid are as follows:

    dH(combustion) = -1336kJ/mol
    C4H4O4(s) + 3O2 -> 4CO2(g) + 2H2O(l)

    dH(combustion) = -1469kJ/mol
    C4H6O4(s) + 3.5 O2(g) -> 3H2O(l)

    Find the energy of the C=C bond

    H-H: 432 kJ/mol
    C-H: 413 kJ/mol
    C-C: 347 kJ/mol

    H2O(l): -241.8 kJ/mol
    CO2(g): -393.5 kJ/mol

    2. Relevant equations

    dH(combustion) ≠ dH(formation)

    dH(formation) = sigma(BE reactants) - sigma(BE products) + dH(formation)

    3. The attempt at a solution
  2. jcsd
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