To answer the physics part of this question. Consider it as follows. A site is called +1 if it is Cu and -1 if it is Zn. If you look at the energy function it is clear that it will take a minimum value when Cu neighbors Zn, and you don't have Cu neighboring Cu or Zn neighboring Zn. So one should first imagine an ordered state in which sites alternate Cu-Zn-Cu-Zn etc. This is analogous to an antiferromagnet. Once you have made this identification, you should go back and look at question 5.5 about the antiferromagnet.
What quantity is it that the question should be asking about? Consider a *single site* of the system. Suppose at temperature T=0 this single site is Cu. Now heat up the system, calculate
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