At 0 K, the entropy of carbon monoxide crystal is not zero but has a value of 4.2 J/K ? mol, called the residual entropy. According to the third law of thermodynamics, this means that the crystal does not have a perfect arrangement of the CO molecules.
(a) What would be the residual entropy if the arrangement were totally random?
(b)Comment on the difference between the result in (a) and 4.2 J/K ? mol.