If we know the standard state free energy change, G^o, for a chemical process at some temperature T, we can calculate the equilibrium constant for the process at that temperature using the relationship between G^o and K.

Rearrangement gives

In this equation:

• R = 8.314 J mol^-1 K^-1 or 0.008314 kJ mol^-1 K^-1.
• T is the temperature on the Kelvin scale.