sorry, I really hadn't read the rules.
but I was trying to solve the same thing as if it would solve van't Hoff's equation replacing Kp with Kx
Kp = Kx . (P/Po) ^Δn
ΔG = -R. T. ln kx. (P/Po)^Δn
Ln Kx = AG /-RT . (Po/P)^Δn
my problem is when applying the derivative, i have great difficulties in calculating