Chapter 14 Lecture 2

# Chapter 14 Lecture 2 - Concept of Q: Reaction Quotient: 2...

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Chapter 14 Lecture 2 Equilibrium constant for the sum of two or more reactions is the product of the equilibrium constants N 2 O + ½O 2 2NO Kc = 1.7 X 10-13 2NO + O 2 2 NO 2 Kc = 4.7 X 1013 N 2 O + O2 2NO 2 Kc = ? The Equilibrium constant for the reverse equilibrium is the reciprocal of the forward constant SO 3 SO 2 + ½O 2 Kc = 16.7 SO 2 + ½O 2 SO 3 Kc = The equilibrium constant for a reaction multiplied by a factor is the constant raised to the power of the factor 2SO 3 2SO 2 + O 2 Kc = Several Operations: 2SO 2 + O 2 2SO 3 Kc =

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What to do with solids and pure liquids? Use 1 for the concentration. H 2 O(l) H 2 O(g) K = C(s) + H 2 O(g) CO(g) + H 2 (g) K = NH 4 HS(s) NH 3 (g) + H 2 S(g) K = The size of K Tells you about how things ended up, when equilibrium was achieved. 2HI H 2 + I 2
2 2 2 ] [ ] [ ] [ eq eq eq HI I H K = K = 1.8 X 10 -2 RULES: K < 1 Reaction does not occur much. Equilibrium favoring the left (reactants) K > 1 Reaction proceeds to products. Equilibrium favoring the right (products)

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Unformatted text preview: Concept of Q: Reaction Quotient: 2 2 2 ] [ ] ][ [ HI I H Q = Concentrations Right now, not the equilibrium values, (eq) Initially Only HI ……. . Q = 0 Things that must be: Q < K, [H 2 ] < [H 2 ] eq ; And [I 2 ] < [I 2 ] eq [HI] > [HI] eq Reaction proceeds to right until, Q = K Consider the reaction at equilibrium then By some means: [H 2 ] > [H 2 ] eq ; And [I 2 ] > [I 2 ] eq Things that must be true: Q > K, [HI] is at some “old” equilibrium value [H] old eq < [HI] eq Reaction proceeds to the left until Q = K Disturbing an reaction at equilibrium was described by Henri Le Châtelier When DP was a little kid . . . Problem 50 from Homework: If a 2.5 L reaction vessel at 1000 o C contains: 0.525 mol CO 2 1.25 mol CF 4 0.75 mol COF 2 In what direction will a net reaction occur to restore equilibrium? CO 2 + CF 4 ↔ 2COF 2...
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## This note was uploaded on 04/16/2008 for the course CHEM 1123 taught by Professor Paul during the Fall '06 term at Arkansas.

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Chapter 14 Lecture 2 - Concept of Q: Reaction Quotient: 2...

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