?Grxn versus ?Gorxn

Under any condition of a reacting system, we can define ?Grxn in terms of the REACTION QUOTIENT, Q

?Grxn = ?Gorxn + RT ln Q

At equilibrium, ?Grxn = 0. Also, Q = K. Thus

If ?Grxn < 0 then reaction proceeds to right

If ?Grxn > 0 then reaction proceeds to left

DGorxn = - RT lnK

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