LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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According to Hess’s law ∆H(T 2 ) is equal to the sum
of the enthalpy changes of processes 1, 2, and 3:
For 1 mol of reaction, process 3 consists of changing
the temperature of an amount of each reactant equal
to the magnitude of its stoichiometric coefficient, so
that
Where C P,m(i) is the molar heat capacity of substance
i. The second equality comes from interchanging the
limits of integration and realizing that the
stoichiometric coefficients of reactants are negative.
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