2. (6 points) We did not discuss in class, but there is a so-called 3rd Law of Thermodynamics that specifies an absolute entropy scale (for more details of the classical treatment of 3rd law considerations, see Chapter 6 of the DeVoe text). There are several ways of stating the so-called 3rd Law of Thermodynamics. One is: Every substance has a finite positive entropy, but at zero Kelvin the entropy may become zero, and does so in the case of a perfectly crystalline substance.? Accepting the 3rd Law, how many microstates are present for an isolated system consisting of a perfect crystal at T = 0 K