3.The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid bianthracene, C28H18(s), is determined to be -13920.6 kJ mol-1. What is the Hf° of C28H18(s) based on this value?
Use the following data: Hf° H2O () = -285.83 kJ mol-1 ; Hf° CO2(g) = -393.51 kJ mol-1
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