bond dissociation enthalpy always positive or negative.  why?

Asked by rajenderdagar123 | 4th Jan, 2017, 09:16: PM

Expert Answer:


Thanks for asking us a question in Ask the Expert section of

The bond dissociation enthalpy is the energy needed to break one mole of the bond to give separated atoms - everything being in the gas state. As it takes energy to break a bond, dissociation enthalpies are always positive numbers.


Topperlearning Team.

Answered by Arvind Diwale | 5th Jan, 2017, 06:57: PM