The Mean Separation Between Chlorine, Cl₂, Molecules, at a Temperature

Multiple Choice

The mean separation between chlorine, Cl₂, molecules, at a temperature of 298.15 K and a pressure of 1 bar is 3.5 nm. Given the values of the Lennard-Jones parameters are  = 368 kJ mol^-1 and r_ = 412 pm, use the Lennard-Jones function to calculate the potential energy between pairs of xenon atoms at this separation.

A) -3.9 J mol^-1
B) 0.0 J mol^-1
C) -0.98 J mol^-1
D) -15 J mol^-1