LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Enthalpy Changes at Various Temperatures
An enthalpy change for a reaction at a temperature
other than a temperature found in a table can be
calculated from heat capacity data. Consider the
processes shown in Figure 2.10. The reaction at
temperature T 2 is the process whose enthalpy
change we want to find. Call it process 2. An
alternate pathway with the same initial and final
states consists of processes 3, 1, and 4. Process 3 is
the change in temperature of the reactants from T 2 to
T 1 . Process 1 is the chemical reaction at temperature
T 1 , with a known enthalpy change. Process 4 is the
change in temperature of the products from T 1 to T 2 .
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