For additional help related to this question, please view Key Concept Video 7.9: Determining the Enthalpy of Reaction from Standard Enthalpies of Formation. This can also be found in your text: Chapter 7, Section 9. Determining the Enthalpy of Reaction (24) C(s, graphite) +0,6) COC) AH = -393,5 kJ/mol Calculating the Enthalpy Change for the Combustion of Methane C(s, graphite + HC) +20,($) Decomposition (+746kD) CHC) + 2 0,66) Enthalpy 00:00 04:49 DV CC What is the standard enthalpy of the reaction N 0(9) + NO,(9) - 3 NO(g)? AH (kJ/mol) Substance NO(g) NO.) NO(9) 81.6 33.2 91.3