Horvath Practice Problems 104

Horvath Practice Problems 104 - ucts and reactants under...

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25 GIBBS FREE ENERGY AND EQUILIBRIUM We have seen that 4 rxn G can tell us if we are at equilibrium and if we are not, it can tell us which way the reaction will proceed to get to equilibrium. Thus there must be some connection between 4 rxn G and both the equilibrium constant K and the reaction quotient Q. Indeed there is a connection, unfortunately you will need to wait until later in your career to derive it from scratch. So, here we will simply state the relation. The equilibrium constant is related to 4 rxn G ° by 4 rxn G ° = RT ln K (25.1) Remember 4 rxn G ° is the di f erence in free energies of the prod-
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Unformatted text preview: ucts and reactants under standard conditions (298 K, 1 atm, [ i ] = 1 M for all species) This relation is very important because we can know K by calculating 4 rxn G for any reaction using the free energies of formation. The 4 rxn G for the reaction under any conditions is given by referencing to 4 rxn G and the reaction quotient, 4 rxn G = 4 rxn G + RT ln Q. (25.2) We will call this equation the 4 G equation and it is the most important equation in all of thermodynamics GIBBS FREE ENERGY AND EQUILIBRIUM 103...
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