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In the equation ∆°G=-RTln(K) Whether K is Kc or Kp? Please explain

In the equation
∆°G=-RTln(K)
Whether K is Kc or Kp? 
Please explain

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1 Answers

Agrata Singh
208 Points
5 years ago
G is  the molar change in free energy when all the reactants and products are in same standard state
Therefore, to get the correct mass action expression for the right hand side, all activities must be given relative to the standard state. The standard state for a gas is 1 bar, not 1 mol/L. Therefore you must express the activities of gases as ratios of the gas pressure to 1 bar, rather than ratios of the gas pressure to 1 mol/L. That's why it has to be Kp and 
not Kc

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