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Why is equilibrium constant related to s...

Why is equilibrium constant related to standard free energy change and not free energy change ?

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Gibbs energy change is related to reaction quotient as `Delta _(r) G = Delta _(r) G^(@) + "RT In Q . When equilibrium is reached, " Delta_(r) G = 0 and Q = K. " Hence, we have " Delta _(r) G^(@)= -" RT In K ".`
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