Lec-10-Chap14-2-b

Lec-10-Chap14-2-b - Lec-10=Chap14-2-b 9/23/2009 Lec-10:...

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Lec-10=Chap14-2-b 9/23/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 1 Lec-10: Chemical Equilibrium Chapter 14 C+ D+ A+ B+ ab cd         D AB C c K 1 Equilibrium Constants: General Case         D C c K the equilibrium constant expression is Notice that the concentrations correspond to the equilibrium state , for example [A] e . For simplicity we omit the subscript “e” in the following. For a reaction 2
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Lec-10=Chap14-2-b 9/23/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 2 Chemical Equilibrium – Gas phase reactions Ideal gases satisfy the equation of state p V T n R If we have a mixture     AB A B Vn p p p p n n p T n R n A A p V T n R which gives the following expression for the partial pressure of a substance in the mixture: And similar equations for the other substances B, C, … 3 Chemical Equilibrium – Gas phase reactions We can then write for the partial pressure of each substance   A A A R n V p T RT      D A C B ab d cd c c RT pp R K T   we can express the right-hand side of the equilibrium constant equation as C+ D+ A+ B+ Then for the chemical equilibrium         D C c K 4 And similar equations for the other substances B, C, …   A A T p R
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Lec-10=Chap14-2-b 9/23/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 3 Chemical Equilibrium – Gas phase reactions is a constant independent of the concentrations of reactants and products.   CD AB a d c d b a c c b K pp RT   so that the ratio of the pressures 5 At a given temperature T the factor       cd ab RT RT RT   is fixed.
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This note was uploaded on 01/02/2010 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-10-Chap14-2-b - Lec-10=Chap14-2-b 9/23/2009 Lec-10:...

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