**Upon reading the chapter about equilibrium from my physical chemistry book, I was convinced that ΔG=−RTln(Kp)(1) and that Kp=Kx(P∑v)(2) where Kp is the equilibrium constant with respect to pressure and Kx is the equilibrium constant with respect to molar fraction. However, I was not convinced of ΔG=−RTln(Kx) As it would have made more sense that given (1) and (2), that: ΔG=−RTln(Kx(P∑v)) So what am I missing that made me unable to understand how this derivation came to be? Same for Kc, where: Kp=Kc((RT)∑v) yet ΔG=−RTln(Kc)
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