lec11_whc - Grade Distribution for CHE-2B(B) Here...

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Grade Distribution for CHE-2B(B) Here
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Announcements • Exams will be handed back in discussion • Regrades – by the end of discussion – Random photocopying of exams • Chapter 16 – Chemical Equilibrium
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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)
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Equilibrium, K eq Disequilibrium, Q
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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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Equilibrium Constant • Mathematical construct • Homogeneous mixtures aA + bB cC + dD K c = [A] a [B] b [C] c [D] d
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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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H 2 (g) + I 2 (g) 2 HI(g) Write a balanced chemical reaction: = 48.9 ] 10 1.52 [ ] 10 3.84 [ ] 10 69 . 1 [ 3 3 2 2 = c K ] [ ] [ ] [ 2 2 2 I H HI K c =
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“Hess’ Law” Equivalent • For reactions with unknown conditions K c (AB) = =K c (AC) K c (CD) K c (DB) [C] c [A] a [D] d [C] c [D] d [B] b aA cC bB dD K c (AC) K c (DB) K c (CD) ?
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Relationships Involving the Equilibrium Constant • Reversing an equation causes inversion of K . K c = [A] a [B] b …. [G] g [H] h …. a A + b B ….
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lec11_whc - Grade Distribution for CHE-2B(B) Here...

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