Chemical potential for van de Waarls gas

Hello,
In my book, we have two equations to find the chemical potential
µj=(dF/dNj) T, V and N constants

and

µj=-kT ln (ζj/Nj)

We calculated the potential of a Van der Waals gas using each of these equations, but the result is not the same, i want to understand why ?

http://ift.tt/1pLqjnN

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