![enter image description here][1]
For part (a), I know how to take the partial derivatives of S to get chemical potential, pressure. But there seems that I still need one equation to correctly express chemical potential in terms of T and P.
The biggest problem for me is that the gas is not an ideal gas, so I can't use the equation of state to finish the job.
Can anyone give me a hint? [1]: https://i.sstatic.net/63qqd.jpg