In the subsequent reaction CH4+CH4 arrow CH3CH3+H2 two C-H bonds are broken(bond energy =412 kj/mol) to form a new C-C bond (bond energy=348 kj/mol and a new H-H bond(bond energy=436 kj/mol). Approximate the enthalpy in this reaction. Is it endothermic or exothermic: For exothermic reactions the combined energies of the new bonds must be larger than the combined energies of the broken bonds. Balanced the subsequent unbalanced reaction and compute its standard free energy change (under standard reactions). Define whether the reaction is spontaneous or nonspontaneous under standard conditions C2H5OH(l)+O2(g) arrow CO2(g)+H2O(l) C2H5OH(l) O2(g) CO2(g) H2O(l) deltaH kj/mol -277.7 0 -393.5 -285.8 deltaG kjmol -174.8 0 -394.4 -237.1