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Bond energy of a diatomic molecule is gi...

Bond energy of a diatomic molecule is given as the change in internal energy due to dissociation of that molecule. Calculate the bond energy of `O_(2)`. Given: `O_(2)(g)to2O(g),DeltaH=498.3kJ*mol^(-1),T=298K`.

Text Solution

Verified by Experts

In the dissociation reaction of `O_(2)` molecule, `Deltan=2-1=1`
We know, `DeltaH=DeltaU+DeltanRT`
As given, `DeltaH=498.3kJ*mol^(-1),T=298K`
`therefore 498.3=DeltaU+(1xx8.314xx10^(-3)xx298)`
or, `DeltaU=495.8kJ`
`therefore`bond energy of `O_(2)` molecule=495.8`kJ*mol^(-1)`.
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