Question

Sure, here's a question for the student to solve:What is the bond dissociation energy (in kJ/mol) for the carbon-hydrogen bond in methane (CH4) given that the enthalpy change for the reaction CH4(g) → CH3(g) + H(g) is +435 kJ/mol?

Answer 1

The bond dissociation energy is the energy required to break a specific chemical bond. In this case, we are looking for the energy required to break the carbon-hydrogen bond in methane  CH4 . The given enthalpy change for the reaction CH4 g   CH3 g  + H g  is +435 kJ/mol. This reaction represents the breaking of one C-H bond in methane.Since the reaction involves breaking one C-H bond, the bond dissociation energy for the carbon-hydrogen bond in methane is equal to the enthalpy change for the reaction. Therefore, the bond dissociation energy for the C-H bond in methane is +435 kJ/mol.