Problem: A reaction has a standard free-energy change of -14.90 kJ mol -1 (-3.561 kcal mol-1). Calculate the equilibrium constant for the reaction at 25°C.

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We’re being asked to determine the equilibrium constant (K) at 25 ˚C for a given reaction.


Recall that ΔG˚rxn and K are related to each other:


ΔG°rxn=-RTlnK


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Problem Details

A reaction has a standard free-energy change of -14.90 kJ mol -1 (-3.561 kcal mol-1). Calculate the equilibrium constant for the reaction at 25°C.


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