C401Ch17LN2 - Chapter 17: Thermodynamics Part 2 Calculating...

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Chapter 17: Thermodynamics Part 2 Calculating ± G° from Standard Free Energies of Formation You learned how to calculate ± G from ± G = ± H – T ± S If you are under standard conditions (25°C, 1 atm, 1M for sln), then it is ± G°, so the equation becomes ± G° = ± H° – T ± • Just like ± H° and ± S°, we can calculate ± G° as follows: ± G° = ± ± products ± ± reactants There are Tables full of what we call the Free Energies of Formation, or the Free Energy required to make the substance from its elements: For the following rxn, calculate ± G°. Is this rxn spontaneous under standard state conditions? ± G° and Rxn Composition ± G° tells you which direction a rxn will be spontaneous at standard conditions . But most rxns are not conducted at standard conditions, but are at elevated or lowered temperature, and elevated or lower pressure, and solution concentrations higher or lower than 1M. How do you calculate ± G for a rxn which is not at standard conditions? There is a mathematical relationship between ± G°, ± G, T, and Q, the rxn quotient which you learned about earlier.
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This note was uploaded on 06/25/2008 for the course CHEM 400-401 taught by Professor Dr.samples during the Fall '06 term at American River.

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C401Ch17LN2 - Chapter 17: Thermodynamics Part 2 Calculating...

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