LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Process 1 is the adiabatic reaction, for which ∆H is
equal to zero. Process 2 is the reaction carried out
isothermally. Process 3 is the change in temperature
of the products plus any remaining reactants to the
same final state as process 1. Because enthalpy is a
state function, the enthalpy change of process 1 is
equal to the sum of the enthalpy changes of
processes 2 and 3:
If a stoichiometric mixture is taken and if the reaction
proceeds to completion, there are no remaining
reactants, and we can write
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