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The correct relationship between free energy and equilibrium constant K of a reaction is

1. ΔG° = -RT ln K
2. ΔG = RT ln K
3. ΔG° = RT ln K
4. ΔG = -RT ln K

Correct answer: ΔG° = -RT ln K

Solution

The standard Gibbs free energy change (ΔG°) is related to the equilibrium constant (K) by the equation ΔG° = -RT ln K, where R is the gas constant and T is the temperature in Kelvin.

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