Bond Energy

by • 22/08/2013 • GeneralComments (0)417

Bond Energy:

The amount of heat energy absorbed or released when one mole of a molecule is formed or dissociate due to formation of all bonds or breakage of all bonds is called “Heat Energy”.

 

Dependence:

Bond energy depends upon:

a. Polarity of molecule.

b. Bond length

a) Polarity of molecules:

Bond energy depends upon polarity of molecules; greater will be bond energy of that molecule. That is why the bond energy of polar molecules is greater as compared to non-polar molecules.

 

Example:

H clearly shows that due to greater electrons gravity of ‘F‘ the bond energy of HF is greater as HCL.

Bond Energy:

Bond energy also depends upon bond length of molecules. Lower the bond of a molecule greater the distance between atoms; therefore, less attraction is present between so less energy is required to decompose that molecule and vise versa, Example:

 

H2 ————–> 2H ∆ = 435 Kj / mole

O = O———–> 2O ∆ = 498 Kj / mole

N = N———–> 2N ∆ = 946 Kj / mole

 

Since the bond length of N2 molecule is smallest in the above example, therefore it has highest bond energy.

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