bond dissociation enthalpy always positive or negative.  why?
 

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

Expert Answer:

Dear rajenderdagar123@gmail.com

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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.

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