chap-15-2011W-a

Reaction rate but not equilibrium reaction

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Unformatted text preview: on rate but not equilibrium reaction equilibrium Equilibrium & Reaction Rates A R ate F o rw a rd kf kr B R ate re verse Equilibrium is Equilibrium the end of a end process k f × C reactan ts = k r × C p ro d u cts k f [ A] = kr [B ] kf [ B] [Products] K= = = kr [ A] [Reactants] Equilibrium Equilibrium constant Law of Law Mass Action Action aA + bB kf kr d D + eE [D]d [E]e K= a b [A] [B] Equilibrium-constant expression constant depends only on the stoichiometry of the reaction, not on its of not mechanism. mechanism. Equilibrium constant (K) Homogenous equilibrium: → N 2 O 4 ( g ) ← 2 N O 2 ( g ) 2 [ NO2 ] Kc = [ N 2O 4 ] K In most of cases: Kc ≠ K p p = 2 p N O2 PN 2 O 4 Equilibrium Constant K aA( g ) + bB ( g ) kf kr cC ( g ) + dD ( g ) At Equalibrium : k f [ A]a ⋅ [ B ]b = kr [C ]c ⋅ [ D]d Law of Mass Action Kc = Unit: (mol/L)∆n [ C ]c ⋅ [ D ]d = a b [ A] ⋅[B ] kf kr ni Pi = R T = ci R T V PV = n i R T i c ∆n = (c + d ) − (a + b) Unit: (atm)∆n d pc ⋅ pd ∆n K p = a b = K c ⋅ ( RT ) pa ⋅ pb ∆n = (c + d ) − (...
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