This chemistry video tutorial explains how to calculate the enthalpy of reaction by using the average bond dissociation energies listed in a table. It contains examples and practice problems of calculating the enthalpy of formation of 1 mole of HCl, the enthalpy of combustion of methane and the enthalpy of reaction between methane and chlorine. The enthalpy of reaction is equal to the sum of all the bond energies of the reactant minus the sum of all the bond energies of the products. Breaking a bond is an endothermic process while forming a bond is an exothermic process.

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