Question

Calculate the bond dissociation energy of the H-H bond in the H2 molecule. Given the bond length of H2 is 74 pm and the enthalpy change for the reaction H2(g) → 2H(g) is 436 kJ/mol.

Answer 1

The bond dissociation energy is the energy required to break a bond in a molecule. In this case, we are given the enthalpy change for the reaction H2 g   2H g , which is the same as the bond dissociation energy for the H-H bond in the H2 molecule.The enthalpy change for the reaction is given as 436 kJ/mol. Therefore, the bond dissociation energy of the H-H bond in the H2 molecule is 436 kJ/mol.