Calculate the bond dissociation energy of the H-H bond given the following information: The enthalpy change for the reaction 2H2(g) → 4H(g) is +436 kJ/mol, and the average bond dissociation energy for a H-H bond is 436 kJ/mol.

Question

Calculate the bond dissociation energy of the H-H bond given the following information: The enthalpy change fo

Answer 1

To calculate the bond dissociation energy of the H-H bond, we can use the given enthalpy change for the reaction and the stoichiometry of the reaction.The reaction is: 2H2 g   4H g The enthalpy change for this reaction is +436 kJ/mol. Since there are two H-H bonds in 2 moles of H2, we can divide the enthalpy change by the number of H-H bonds to find the bond dissociation energy for a single H-H bond.Bond dissociation energy of H-H bond =  Enthalpy change for the reaction  /  Number of H-H bonds Bond dissociation energy of H-H bond =  +436 kJ/mol  / 2Bond dissociation energy of H-H bond = 218 kJ/molSo, the bond dissociation energy of the H-H bond is 218 kJ/mol.