lec11 - K c (DB) [C] c [A] a [D] d [C] c [D] d [B] b aA cC...

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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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Unformatted text preview: 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) ? Gas Phase Equilibria Can use partial pressures P A V = n A RT aA(g) bB(g) Kc = [B] b [A] a (n B /V) b (n A /V) a P B b P A a (RT) ab = (RT) ab K p = = Heterogeneous Equilibria Different phases pure phase is constant Recall demonstration HgCl 2 (s) Hg 2+ (aq) + 2Cl-(aq) K c = [Hg 2+ ][Cl ] 2 Example Given that K c for the dissociation of bromine chloride is 377 at 300 K and that the equilibrium partial pressures of bromine and chlorine are P Br = .32 atm and P Cl = .71 atm find the partial pressure of BrCl(g)....
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lec11 - K c (DB) [C] c [A] a [D] d [C] c [D] d [B] b aA cC...

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