# Problem: A reaction has a standard free-energy change of -13.50 KJ mol-1 (-3.227 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 degrees Celsius.

###### FREE Expert Solution

We’re being asked to determine the equilibrium constant (K) at 25 ˚C for the reaction with ΔG of -13.50 KJ mol-1.

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

$\overline{){\mathbf{\Delta G}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{-}}{\mathbf{RTlnK}}}$

Step 1: We first need to convert ΔH˚ from kJ to J:

ΔG˚rxn = – 13500 J/mol

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###### Problem Details

A reaction has a standard free-energy change of -13.50 KJ mol-1 (-3.227 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 degrees Celsius.