Answer to Question #94261 in Physical Chemistry for Abhishek

Question

Differentiate between bond dissociation energy and Bond enthalpy with the help of one example each.

Answer 1

Bond enthalpy (energy) is the average of all the bond-dissociation energies in a molecule, and will show a different value for a given bond than the bond-dissociation energy would.

For example, methane has four C–H bonds and the bond-dissociation energies are 435 kJ/mol for D(CH₃–H), 444 kJ/mol for D(CH₂–H), 444 kJ/mol for D(CH–H) and 339 kJ/mol for D(C–H). Their average, and hence the bond energy, is 414 kJ/mol, even though not a single bond required specifically 414 kJ/mol to be broken.

https://en.m.wikipedia.org/wiki/Bond_energy