Answer :
What is the potential energy of molecule?
The potential energy of molecules interaction U depends on the average distance between molecules for the van der Waals gas and, consequently, it changes with the change in the volume occupied by gas. When there is no exchange of energy between the gas and its environment, the internal energy of gas should remain constant. Hence, if one part of the energy changes, there should be a respective alteration in the other part: dU = –dK.
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