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Difference Between Bond Energy and Bond Dissociation Energy Enthalpy

Bond Energy Vs. Bond Dissociation Energy (Enthalpy)

Bond energy is the average value of the gas-phase bond dissociation energies (usually at a temperature of 298 K) existing between the same types of atoms. However, bond energy and bond dissociation energy are not the same. Bond dissociation energy is the standard enthalpy change when a covalent bond (also termed as a molecular bond, is a chemical bond between two non-metal atoms, that involves the sharing of electron pairs between those atoms) is cleaved by homolysis (breakdown to equal pieces) to give fragments; which are usually radical species. Hence, the major difference between bond energy and bond dissociation energy is that bond energy is an average value whereas bond dissociation energy is a particular value for a particular bond.

 

What is bond energy and bond dissociation energy (enthalpy)?

 

Bond Energy

Bond energy refers to the energy that is required to break down all the bonds that exist between the same 2 type of chemical species in a compound.

A plot of the potential energy of a 2-atom system and the distance between the chemical species shows the distance at which the energy is too less. This distance revealed is the bond length between the atoms.

The higher the bond energy (E) linked with a specific chemical species pair, the stronger the bond is said to be, and lesser the distance between the 2 atoms.

 

Bond Dissociation Energy

Bond dissociation energy (enthalpy) (H) is the amount of energy required for breaking down a particular bond in homolysis. We can define it as the enthalpy change that takes place when a bond undergoes cleavage by homolysis. Bond dissociation energy is specific to a single bond.

Bond enthalpy, (thermodynamic property of a system) or bond dissociation energy, is termed as the standard enthalpy change when a bond is cleaved (separated or divided) by homolyses (breaking down into small pieces) with reactants and products of the homolysis reaction at 0 K (absolute zero).

 

Difference between Bond Energy & Bond Dissociation Energy (Enthalpy)

Description

Bond energy

Bond energy is also termed as bond enthalpy and it is defined as the measure of bond strength in a chemical bond. Bond energy is an average value 

Bond dissociation energy

Bond dissociation energy is defined as the standard enthalpy change which is required to break a chemical bond

Product

Bond energy

Bond energy offers the energy needed to form the atoms which are the starting material for bond formation.

Bond dissociation energy

Bond dissociation energy provided the energy needed to form free radicals from the atoms which created that particular bond.

Example

Bond energy

In chemistry, bond energy (E) or bond enthalpy (H) is the measure of bond strength in a chemical bond. … For example, the (C-H) carbon–hydrogen bond energy in methane (CH4) is the enthalpy change involved with breaking up one molecule of CH4 into a carbon (C) atom and four hydrogen (H) radicals, divided by four.

Bond dissociation energy

For example, in methane molecule, bond dissociation energies for C-H bonds are 439 kJ/mol, 460 kJ/mol, 423 kJ/mol and 339 kJ/mol. However, the bond energy of the C-H of methane is 414 kJ/mol, which is the average of all four values. Further, for a molecule, bond dissociation energy may not necessarily be equal to the bond energy (as for above-given methane example). For a diatomic molecule, bond energy and the bond dissociation energy are the same.

Symbol

Bond energy

It is denoted by E

Bond dissociation energy

It is denoted by H

Bond Formation

Bond energy

It gives the energy needed to form the atoms which were the starting material for bond formation

Bond dissociation energy

It gives the energy required to create free radicals from the atoms which created that particular bond

 

Summary of Bond Energy vs. Bond Dissociation Energy

The points of difference between Bond energy and Bond dissociation energy have been summarized as below:

 

Dr. Amita Fotedar -Dr

Research Consultant: PhD in Environmental Sciences at History of working in Elite Research Institutes like United Nations Development Program
Dr Amita Fotedar is an experienced Research Consultant with a demonstrated history of working in elite Research Institutes like United Nations Development Programme, Istanbul, Turkey, Indian Institute of Science, Bangalore, India and International Water Management Institute, Colombo, Srilanka.
Skilled in Biological Sciences, Environmental Health, Natural Resources, Water Resource Management, and Renewable Energy, she has a PhD in Environmental Sciences from the University of Jammu, India. Apart from her PhD, she has a Post Graduate Diploma in International Studies from International Pacific University, New Zealand Campus, and has also been rewarded a certification in Climate Studies from Harvard University (EdX). She is a recipient of Academic Excellence Award from International Pacific University, New Zealand campus. At present she is pursuing MicroMasters in Sustainable Energy from The University of Queensland, Australia.
She is a Co- founder and Research Advisor for a New Zealand based Sustainability and Environmental Services Entity and is also a member of the Environmental Peacebuilding Association at SDG Academy, offering mentorship (a collaborative network of academic and research institutions under the auspices of UN Secretary-General). She has around 35 national and international publications to her credit.
Dr. Amita Fotedar -Dr

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References :


[0]Benson, S. W. (1965). III-Bond energies. Journal of Chemical Education, 42(9), 502.

[1]Blanksby, S. J., & Ellison, G. B. (2003). Bond dissociation energies of organic molecules. Accounts of chemical research, 36(4), 255-263.

[2]Darwent, B. D. (1970). Bond dissociation energies in simple molecules (No. NSRDS-NBS-31). National Standard Reference Data System.

[3]Szwarc, M. (1948). The C–H bond energy in toluene and xylenes. The Journal of Chemical Physics, 16(2), 128-136.

[4]Treptow, R. S. (1995). Bond Energies and Enthalpies: An Often-Neglected Difference. Journal of chemical education, 72(6), 497.

[5]Image credit: https://commons.wikimedia.org/wiki/File:Internuclear_separation_with_respect_to_bond_length.png

[6]Image credit: https://commons.wikimedia.org/wiki/File:Bond_Energy_Diagrams.png

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