12 - Quantifying the Relationship between K and T (add to...

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Quantifying the Relationship between K and T (add to notes at the end of lecture 7). LeChatelier’s Principle gives us a way to argue the direction in which a reaction will shift with change in temperature. But is there a way to quantify this? Of course, and it is shown below without derivation (which awaits those of you who have to take physical chemistry in a couple of years.) Here it is, the van’t Hoff equation: Note a few things about to note about the equation: • It is of a form identical to the Clausius Clapeyron, which makes sense in that the Clausius Clapeyron explains the temperature dependence of a physical equilibrium phenomenon (vapor pressure) and van’t Hoff generalizes this to any equilibrium phenomenon. • Also note that the qualitative picture of the direction in which a reaction shifts from LeChatelier’s principle (exothermic to the left as T goes up and endothermic to the right as T goes up) is consistent with the Van’t Hoff equation. • The change in enthalpy, which you can determine using anything from a bomb calorimeter calculation to a heat of formation
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This note was uploaded on 02/11/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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12 - Quantifying the Relationship between K and T (add to...

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