Van der waals partition function

I’m studying for my exam and there is a question in this exercise that I don’t get
1. The problem statement, all variables and given/known data

Consider the partition function of a gas of N particles

Z = 1/N! (2*pi*m*k*T/h²)3N/2 (V-Nb)N exp(a*N²/(VkT))

a. Find the equation of state
b. Find the Energy and Cv
c. What is the partition function for one molecule ? ( You can’t simply take N=1 in the partition function)

2. Relevant equations

3. The attempt at a solution
a) b) Solved

c. I don’t know how to solve this ?


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