Ch_322a_3.014

Ch_322a_3.014 - Enthalpy and Entropy Gibbs defined his...

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Enthalpy and Entropy Gibbs defined his function of state in terms of enthalpy or heat ( H ) and entropy ( S ), two thermodynamic state functions. State functions define the properties of a thermodynamic state. In a change between two thermodynamic states, the change in value of the state function is given by the symbol ! . The standard free energy change ( ! G o ) is given as ! G o = ! H o - T ! S o where ! H o is the standard enthalpy change and is equal to the difference in the standard enthalpies of formation ( ! H o f ) between the products and the reactants. This state function is associated with changes in bonding between reactants and products. Changes in enthalpy during reactions are measured by calorimetry experiments.
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Standard Entropy Change, ! S o The standard entropy change, ! S o , is the difference in standard entropies between reactants and products. Entropy is a measure of the degree of order in a chemical system due to bond rotations, other molecular motions, and aggregation. The more random a
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_3.014 - Enthalpy and Entropy Gibbs defined his...

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