$$\Delta H_{\mathrm{reaction}} = \sum \Delta H_f^{\ominus}(\mathrm{products}) - \sum \Delta H_f^{\ominus}(\mathrm{reactants})$$
Total enthalpy change is independent of path; calculated from standard formation enthalpies.
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CAT Formulas
Chemical Thermodynamics
Hess's Law
$$\Delta H_{\mathrm{reaction}} = \sum \Delta H_f^{\ominus}(\mathrm{products}) - \sum \Delta H_f^{\ominus}(\mathrm{reactants})$$
Total enthalpy change is independent of path; calculated from standard formation enthalpies.
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