Chemistry — Bond Enthalpy & Hess
Reaction enthalpy from bond energies, formation enthalpies and Hess's law.
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\Delta H = \sum E_{broken} - \sum E_{formed}
\Delta H = \sum \Delta H_f^\circ(\text{prod}) - \sum \Delta H_f^\circ(\text{react})
\Delta H_1 = \Delta H_2 + \Delta H_3 \;\;\text{(Hess)}
q = mc\,\Delta T