IMG_0005_NEW - _[Products] =L =K (a constant) fReactants I...

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Lg T'DAY,S LECTURE: *CHEMICAL EQUILIBRIUM'' . Equilibrium is dynamic . Law of mass action . Expressions involving pressure . Activities . Heterogeneous equilibria Law of Mass Action aA+bB - cC+dD From many experimental observations : - _ [cr[D]o ^ - p11n1b Exp. lNzor];. [No2]- [Nzoo]* [Noz]* K I 0.0 0.0200 0.00140 o.ot72 o-vl 2 0.0 0.0300 0.00280 0.0243 a .1.t1 3 0.0 0.()400 o.oo452 0.0310 ozl 4 0.0200 0.0 0.004.52 0.0310 <'' Yl Goncept of Equilibrium State in which [Reactantsl and [Products] remain constant with time. BUT Equilibrium is \namic not Static Forward and Reverse reactions continue to occnr but at equal rates 3 no net change k Reactants --:1- Products k_r Rate of Forward Reaction = Rate of Reverse Reaction fr, [Reactants] : fr_, [Products]
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Unformatted text preview: _[Products] =L =K (a constant) fReactants I k, o @ Equilibrium Gonstants aA + bB - cC + dD K-[Cf[D]o lAl"[B]" Equilibrium constants are thermodynamic quantities. . Tell us the equilibrium position NOT how fast it is obtained All Reactions are Equilibria Some are just more "equal" than others. . KVery Large = strongly favours products or it "goes to completion" . KVery Small + strongly favours reactants, or "no reaction occurs" I Kfor Reverse Reaction cC+dD-aA+bB lAl"lBlo I l\'=-=_ lcl"[D]' K o 6 Multiplying molar ratios by a factor (n) naA + nbB -- ncc + ndD K'-[c]*[D]". =K' IA]""IB]"" K is unique for a given reaction at a siven temperature 4...
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This note was uploaded on 12/27/2011 for the course CHEM 122 taught by Professor Williams during the Fall '10 term at Simon Fraser.

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