Question

Calculate the bond dissociation energy (in kJ/mol) for the breaking of the carbon-hydrogen (C-H) bond in methane (CH4), given the following information: CH4 (g) → CH3 (g) + H (g)     ∆H = 432 kJ/mol Note: The bond dissociation energy is the amount of energy required to break a bond between two atoms in a molecule, resulting in two separate atoms

Answer 1

The given reaction represents the breaking of one C-H bond in methane  CH4  to form a methyl radical  CH3  and a hydrogen atom  H . The enthalpy change  H  for this reaction is given as 432 kJ/mol. Since the reaction represents the breaking of one C-H bond, the bond dissociation energy for the C-H 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 432 kJ/mol.