Horvath Practice Problems 105

Horvath Practice Problems 105 - tem would move toward...

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The di f erence between 4 rxn G and 4 rxn G ° One point of confusion that often occurs is the distinction be- tween 4 rxn G and 4 rxn G ° . 4 rxn G ° is a constant for a given reaction that never changes over the course of the reaction. 4 rxn G is not constant, it changes from negative to zero as the reaction proceeds towards equilibrium. Both 4 rxn G and 4 rxn G ° tells us things about the character of the reaction. Since 4 rxn G ° is the di f erence in free energies of the products and reactants under standard conditions, the value of 4 rxn G ° tells us whether or not the reaction is product favored or reac- tant favored. We see this because at standard condition all species present (both reactants and products) are 1 M. If 4 rxn G ° < 0 then under these standard conditions the sys-
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Unformatted text preview: tem would move toward forming more products. Thus it is product favored. If 4 rxn G &gt; then under these standard conditions the sys-tem would move toward forming more reactants. Thus it is reactant favored. Lets see how this connects with the notion of product favored or reactant favored that we got from K. We said if K &gt; 1 , the reaction would be product favored. Con-versely if K &lt; 1 , then the reaction is reactant favored. From 4 rxn G = RT positive z }| { ln &gt; 1 K = negative (25.3) 4 rxn G = RT ln K &lt; 1 | {z } negative = positive 104 GIBBS FREE ENERGY AND EQUILIBRIUM...
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