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    Calculating the change in enthalpy (delta H) using bond energies.

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    Estimate the change in enthalpy for the following reaction using bond energies:
    2 H2 + O2 ---> 2 H2O

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    The reaction involves the breaking of an H-H bond, the breaking of an O-O bond, and the formation of two O-H bonds.

    The following bond energies (B.E.) for each ...