ch. 9 II

ch. 9 II - Review: aA + bB cC + dD At equilibrium: forward...

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• At equilibrium: forward rxn rate = backward rxn rate • Mass action law: dD cC bB aA + + [] [ ] [ ] [ ] c d e q e q a b e q e q C D K A B = Review: • K > 1 --> more products K < 1 --> more reactants K = 1 --> equal mixture @ equilibrium
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Demo: 2NO 2 <-> N 2 O 4 + E equilibrium Effect of temperature E > 0 : low T -> larger K, more products high T -> smaller K, more reactants E Rxn coordinate RT E RT E E RT E RT E e A A e A A e A e A k k K a a a a - - - - - - - - = = = = - - 1 1 ) ( 1 1 1 1 1 1 1 1 1 1 E a1 E a2 E
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K c vs K p and units b a d c c B A D C K ] [ ] [ ] [ ] [ = b B a A d D c C p P P P P K = dD cC bB aA + + nRT pV = cRT RT V n p = = b b a a d d c c b B a A d D c C p RT c RT c RT c RT c P P P P K ) ( ) ( ) ( ) ( = = ( 29 ( 29 b a d c c b a d c b b a a d d c c p RT K RT c c c c K - - + - - + = =
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If P ref =1atm, P ref a+b-c-d =1! b a d c c B A D C K ] [ ] [ ] [ ] [ = b B a A d D c C p P P P P K = b ref B a ref A d ref D c ref C P P P P P P P P ) / ( ) / ( ) / ( ) / ( d c b a ref p d c b a ref b B a A d D c C b ref B a ref A d ref D c ref C P K P P P P P P P P P P P P P - - + - - + = = ) / ( ) / ( ) / ( ) / ( Units of K c and K p Dimension of K c : [concentration] (c+d-a-b) Dimension of K p :
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ch. 9 II - Review: aA + bB cC + dD At equilibrium: forward...

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