ME300Lecture28

ME300Lecture28 - Lecture 28 Equilibrium Composition Recall...

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28.1 Lecture 28: Equilibrium Composition Recall the equation of reaction: i i i i prod react o i i i,T ref o o i i i i,T i i,T ref ref prod react A B C D A A B B C C D D y p Substituting g RTln p y p y p g RTln g RTln p p Consider the reaction : A B C D Then,
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28.2 Continue Equilibrium Composition o o A B A A,T B B,T ref ref o o C D C C,T D D,T ref ref o o o o A A,T B B,T C C,T D D,T C C ref Then, y p y p g RTln g RTln p p y p y p g RTln g RTln p p Regroup, g g g g y p RT ln p D A B D A B ref ref ref o o i i i i,T i i,T i i react prod prod react ref ref y p y p y p ln ln ln p p p Then, in general: y p y p g g RT ln ln p p
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28.3 Continue Equilibrium Composition We define: » Standard Gibbs Free Energy of Reaction for the equilibrium reaction at temperature T and pressure p=1 atm (evaluated as if each component is separated at T and p) » Note: o T G f(T) only! i i i i o T i i i i prod react ref ref o T i i prod react ref ref o T i i prod react ref ref G y p y p ln ln RT p p G y p y p ln ln RT p p G y p
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