When you are considering the chemical reaction equilibria, the equilibrium constant (K) obviously plays a major role in describing the kinetics of the reaction at the temperature being studied. That is what makes K such a useful parameter, telling a plant designer at an early stage if a chemical product will be formed or not. So how do you calculate K 2 , well its pretty straight forward: with K 1 the equilibrium constant at 298K and assuming hrxn is not a function of temperature, I'll discuss the method for determining K 2 when hrxn(T) in a later post, the reason for using K 1 at 298K is that experimental data is regularly available for chemicals at this temperature: Enthalpy chemical i at 298K Gibbs energy of chemical i at 298K Thus using 298K values as your basis, and working from there. K 2 and T 2 values are the wanted equilibrium constant and the new temperature, respectively. with: ...