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Question

Which quantity out of ΔrG and ΔrG will be zero at equilibrium?


Solution

Gibbs energy for a reaction in which all reactants and products are in standard state. ΔrG is related to the equilibrium constant of the reaction as follows
ΔrG=ΔrG+RT In K
At equilibrium, 0=ΔrG+RT In K     ( ΔrG=0)
or        ΔrG=RT In K
ΔrG 0 when K =1
For all other values of K, ΔrG will be non-zero.

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