Calculation of Cohesive energy of a solid:

“The amount of energy required to separate the atoms in a crystalline solid is known as cohesive energy also called as bonding cohesive energy

Or the amount of energy required to separate the atoms in a crystalline solid is known as cohesive energy or dissociation cohesive energy.

At equilibrium position the PE of either atom is given by

U= decrease in P.E due to F.A + increase in PE due to F.R

Since the work done on the system is stored as PE, it can be calculated by integrating the equation

This is the expression for cohesive energy of a molecule containing two atoms in a solid. The energy Umin is called Bonding energy or dissociation energy or cohesive energy.