I have no clue and need help on this one. A second metabolic process involves the net production of 2 ATP and 2 NADH from 2 ADP and 2 NAD+. If the conversion of these molecules is endothermic and adds 443.5 kJ to the overall enthalpy of the rxn, find the enthalpy for a "high-energy" phosphate bond. Ans = 338.5 kJ/mol Given but I am not sure it's necessary. O=O 497 C=O 805 O-H 464 C-C 347 Thanks!!!