lec11 - Dynamic Equilibrium Vapor pressure Chemical...

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1 Dynamic Equilibrium • Vapor pressure • Chemical reactions – Forward process N 2 (g) + 3H 2 (g) 2NH 3 (g) – Reverse process 2NH 3 (g) N 2 (g) + 3H 2 (g) Chemical Equilibria • Haber process N 2 (g) + 3H 2 (g) 2NH 3 (g) • Consider the divalent salts … ZnCl 2 (s) Zn 2+ (aq) + 2Cl - (aq) HgCl 2 (s) Hg 2+ (aq) + 2Cl - (aq)
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2 Equilibrium Constant • Mathematical construct • Homogeneous mixtures aA + bB cC + dD K c = [A] a [B] b [C] c [D] d Example Hydrogen gas is reacted with iodine gas to form hydrogen iodide [HI(g)] at T = 750 ° C. Find K c from the equilibrium gas concentrations: [H 2 ] = 3.84x10 –3 mol/L [I 2 ] = 1.52x10 –3 mol/L [HI] = 1.69x10 –2 mol/L
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3 “Hess’ Law” Equivalent • For reactions with unknown conditions K c (AB) = =K c (AC) K c (CD)
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This note was uploaded on 04/23/2008 for the course CHEM 2B taught by Professor Clemens during the Winter '08 term at UC Davis.

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lec11 - Dynamic Equilibrium Vapor pressure Chemical...

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