Energy released forming 2NH3 and 2H2O. Explaining the terms. Bond dissociation energy is the energy required to break a particular bond in a particular molecule. A diatomic molecule is one that only contains two atoms. There is no equation for reacting CaCl2 and H2O. 5H2 bonds = 5(436kJ) = 2180 kJ. They could be the same (for example, Cl 2) or different (for example, HCl).. Average Bond Energies: C-H = 413 kJ/mol O-O = 498 kJ/mol C=O = 799 kJ/mole (for CO2) H-O = 467 kJ/mol a) -2057 kJ b) -818 kJ c) -355 kJ d) -19 kJ e) 116 kJ I have been trying to figure this out for ages. Bond dissociation enthalpy and mean bond enthalpy. There are 3N-H bond in NH3 so 2NH3 has 6N-H bonds In electrolytic, or ionic, dissociation, the addition of a solvent or of energy in the form of heat causes molecules or crystals of the substance to break up into ions (electrically charged particles). Its condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid.. Its acid strength is much greater than that of acetic acid.Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C [1ΔS f (NH4+1 (aq)) + 1ΔS f (NO3-1 (aq))] - [1ΔS f (NH4NO3 (s))] [1(113.39) + 1(146.44)] - [1(151.08)] = 108.75 J/K 108.75 J/K (increase in entropy) This is because nothing happens when these two chemicals combine because there is no reaction. Simple diatomic molecules. Energy required to break bonds: 2NO bonds = 2(631 kJ) = 1262 kJ. The bond dissociation enthalpy is the energy needed to break one mole of the bond to give separated atoms - everything being in the gas state. It takes energy to break bonds and energy is released when bonds are formed. Given the average bond energies listed below, estimate H for the following reaction: CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) Hrxn = ?? Oxalic acid is an organic compound with the formula C 2 H 2 O 4.It is a white crystalline solid that forms a colorless solution in water. Dissociation, in chemistry, the breaking up of a compound into simpler constituents that are usually capable of recombining under other conditions. I know the answer is -818 but I dont know it got there. There are two types of bond energy: bond dissociation energy and characteristic (or “average”) bond energy.