In Chapter 10 a negative free energy change was used as a criterion for spontaneity. The standard free energy change, (298) is the free energy of the reaction with all substances at 298K, all gases at partial pressure of 1 atm, and all dissolved substances at concentration of 1 mole per liter. This standard free energy change and the equilibnum constant are related by the above expressions .
A large negative standard free energy change for a reaction indicates a large value for ,

and a large positive standard free energy change means an extremely small value for . If = 0.000, then = 1.000.
In Chapter 13 we answered the question as to when a reaction would, or would not, be spontaneous and moving toward equilibrium. This chapter dealt with the matter of just how far a reaction would go before it arrived at equilibrium, but still said nothing al'out the time needed to get there. The next chapter will answer this final question: How fast will a chemical reaction go?