Question

The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid heptadecanoic acid, C17H34O2(s), is determined to be -10607.9 kJ mol-1. What is the Hf° of C17H34O2(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

Answer 1

-940.88 kJ mol-1