I just wanted to make sure how we can know whether it is Kc (equilibrium constant of concentrations) or Kp (equilibrium constant of pressures) which "comes out" of the equation, ΔGo=−RTln(K).
Until now, I have always taken Kc when the reaction was in a solution or Kp if it was a gas. But as there is a difference between their values, I'd like to know exactly which one to take.
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