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