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Unformatted text preview: 20.110/5.60 Fall 2005 Lecture #10 page 1 Chemical Equilibrium Ideal Gases Question: What is the composition of a reacting mixture of ideal gases? e.g. N 2 (g, T , p ) + 3/2 H 2 (g, T , p ) = NH 3 (g, T , p ) What are 2 2 , , and N H NH 3 p p p at equilibrium? Lets look at a more general case A A(g, T , p ) + B B(g, T , p ) = C C(g, T , p ) + D D(g, T , p ) The i s are the stoichiometric coefficients. Lets take a mixture of A, B, C, and D with partial pressures , , , and A A A B C C D D p X p p X p p X p p X p = = = = Is this mixture in equilibrium? We can answer by finding G if we allow the reaction to proceed further. We know for an ideal gas in a mixture ( , i T p ) and we know that i i i G n = ( ) ( ) ( ) ( = + + ( ) g, , g, , g, , g, , A A B B C C D D G T p T p T p ) T p 20.110J / 2.772J / 5.601J Thermodynamics of Biomolecular Systems Instructors: Linda G. Griffith, Kimberly Hamad-Schifferli, Moungi G. Bawendi, Robert W. Field 20.110/5.60 Fall 2005 Lecture #10 page 2 where is an arbitrary small number that allows to let the reaction proceed just a bit. We know that ( ) ( ) o g, , ln implied 1 bar i i i i p T p T RT p = + where is the standard chemical potential of species i at 1 bar and in a pure (not mixed) state....
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This note was uploaded on 11/11/2011 for the course BIO 20.010j taught by Professor Lindagriffith during the Spring '06 term at MIT.
- Spring '06