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Unformatted text preview: Lecture 2 Review of the previous Lecture Equilibrium is a delicate balance between competing processes. The expression for the equilibrium constant depends on how the equation is balanced. Chemical equlibria can be homogeneous or h e t ero gen eo us. [ ] [ ] constant [ ] [ ] c d eq eq C a b eq eq C D K A B = = aA+bB cC+dD When dealing with h e t ero gen eo us equilibrium, the pure solids and liquids are not involved in the expression for K c ( K p ). For gasphase reactants and products: Multiple Equlibria: Detailed balance A B C D A B C B A D A C D B In any chemical (physical) system at equilibrium corresponding to complex reaction mechanism, every reaction (elementary or not) is (locally) at equilibrium Any reaction, which is a part of a complex mechanism describing a system at equilibrium is characterized by its own equilibrium constant A + B C + D C + D E + F A + B E + F If a reaction can be expressed as a sum of two or more reactions, the equilibrium constant for the overall reaction is given by the product of the equilibrium constants of the individual reactions. Multiple Equlibria ' [ ][ ] [ ][ ] C C D K A B = " [ ][ ] [ ][ ] C E F K C D = ] ] [ [ ] [ [ ] C E F K A B = ] ] [ [ ] [ ][ ] [ [ ] [ ][ ] E F C D C D A B = ' " C C K K =...
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This note was uploaded on 04/07/2008 for the course BME 50A taught by Professor Botvinick during the Fall '08 term at UC Irvine.
 Fall '08
 BOTVINICK

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