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    Bond Energies & Enthalpies

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    Estimate the change in enthalpy, Delta H, for the following reaction:

    H2(g) + Cl2(g) --> 2 HCl(g)

    © BrainMass Inc. brainmass.com March 4, 2021, 6:21 pm ad1c9bdddf

    Solution Preview

    To work this problem, think of the reaction in terms of simple steps:

    1. First, the reactant molecules, H2 and Cl2, break down into their atoms

    H2(g) --> 2 H(g)
    Cl2(g) --> 2 Cl(g)

    2. Next, these atoms combine to form HCl molecules

    2 H(g) + 2 ...

    Solution Summary

    The expert estimated the change in enthalpy, delta H and reactions.