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The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid...

The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid phthalic acid, C8H6O4(s), is determined to be -3207.3 kJ mol-1. What is the Hf° of C8H6O4(s) based on this value? Use the following data: Hf° H2O () = -285.83 kJ mol-1 ; Hf° CO2(g) = -393.51 kJ mol-1

kJ mol-1

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