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    Bond Energies: Enthalpy Change

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    Dinitrogen monoxide (or nitrous oxide), N_2O(g), can decompose to nitrogen and oxygen gases:

    2 N_2O(g) -> 2 N_2(g) + O_2(g)

    Use average bond energies to estimate the enthalpy change for this reaction.

    © BrainMass Inc. brainmass.com December 24, 2021, 10:30 pm ad1c9bdddf
    https://brainmass.com/chemistry/bonding/bond-energies-enthalpy-change-482401

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    SOLUTION This solution is FREE courtesy of BrainMass!

    ** Please see the attached file for the complete solution **

    Equation:
    (please see the attached file)

    Computing for the enthalpy change of the reaction:
    ∆Hreaction = ∑m(BE of reactants) - ∑n(BE of products)
    ∆Hreaction = [2(BE of N N) + 2(BE of N O)] - [2(BE of N N) + 1(BE of O O)
    ∆Hreaction = [2 mol(945 kJ/mol) + 2 mol(201 kJ/mol)] - [2 mol(945 kJ/mol) + 1 mol(498 kJ/mol)
    ∆Hreaction = 2292 kJ - 2388 kJ
    ∆Hreaction = -96 kJ

    Note: the multiplier 2 takes into account the total number of bonds to be broken as affected by the coefficient of the substance in the balanced equation.

    Source: http://www.chegg.com/homework-help/questions-and-answers/use-bond-energy-values-table-136-estimate-delta-h-thefollowing-reactions-gas-phasetable-13-q300004?frbt=1

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 10:30 pm ad1c9bdddf>
    https://brainmass.com/chemistry/bonding/bond-energies-enthalpy-change-482401

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