Chapter 14, Problem 14B.10P

Interpretation Introduction

Interpretation:

The expression $U=\frac{1}{2}{N}^2{\displaystyle \int V\left(R\right)}\text{d}\tau$ has to be validated.  The cohesive energy density of a uniform distribution of the molecules is equal to $-\left(2\text{π}/3\right)\left(N_{\text{A}}^2/d^3{M}^2\right){\rho }^2{C}_6$ that interact by a van der Waals attraction of the form $-C_6/R^6$ has to be shown.

Concept introduction:

Potential energy of a particle or a system is energy due to its state.  The potential energy of a moving object is zero.  When two particles attract each other, then the potential energy of the system is negative.  When two particles repel each other, then the potential energy of the system is positive.