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Q.
How much energy is required to dissociate one mole of $H _{2}$ molecule?
Chemical Bonding and Molecular Structure
Solution:
Energy gets released when bond is formed between two hydrogen atoms, the $H _{2}$ molecule is more stable than isolated $H$ atoms. The energy so released is called bond enthalpy which corresponds to minimum in the potential energy curve for the formation of $H _{2}$ molecule. Conversely $435.8\, kJ$ energy is required to dissociate $1$ mole of $H _{2}$ molecule.