EquilibriumWkbk

EquilibriumWkbk - CHEM 125 Equilibrium Workbook Chpts. 17...

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CHEM 125 Dr. Pizzini Equilibrium Workbook Chpts. 17 & 20 C HEM 125 S PRING 2009 Equilibrium Workbook Read Chapters 17 and 20 as listed on online syllabus. Useful Equations that you should understand and be able to use! 1 1 = = k k rate reverse rate forward K c For a general reaction : aA + bB cC + dD b a d c c b a d c c B A D C Q B A D C K ] [ ] [ ] [ ] [ : point other any At ] [ ] [ ] [ ] [ : equlibrium At = = Δ n (RT) c K = p K Δ 1 2 rxn 1 2 T 1 - T 1 R - = ln H K K o
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CHEM 125 Dr. Pizzini Equilibrium Workbook Chpts. 17 & 20 Part I. Equilibrium Calculations 1. Write equilibrium constant expressions, K c , for the following reactions: a. 2 NO (g) + O 2 (g) 2 NO 2 (g) b. Zn (s) + 2 Ag + (aq) Zn 2+ (aq) + 2 Ag (s) c. Mg(OH) 2 (s) + CO 3 2- (aq) MgCO 3 (s) + 2 OH - (aq) 2. Write equilibrium constant expressions, K p , for the following reactions: a. CS 2 (g) + 4 H 2 (g) CH 4 (g) + 2 H 2 S (g) b. Ag 2 O (s) 2 Ag (s) + ½ O 2 (g) c. 2 NaHCO 3 (s) Na 2 CO 3 (s) + CO 2 (g) + H 2 O (g) 3. From these values of K c , CO (g) + H 2 O (g) CO 2 (g) + H 2 (g) K c = 23.2 at 600 K SO 2 (g) + ½ O 2 (g) SO 3 (g) K c = 56 at 900 K 2 H 2 S (g) 2 H 2 (g) + S 2 (g) K c = 2.3 x 10 -4 at 1405 K …determine values of K c (and K p ) for the following reactions at the temperatures given: a. CO 2 (g) + H 2 (g) CO (g) + H 2 O (g) b. 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) c. H 2 (g) + ½ S 2 (g) H 2 S (g) 4. Equilibrium is established in the reversible reaction 2 A + B 2 C. The equilibrium concentrations are [A] = 0.55 M, [B] = 0.33 M, [C] = 0.43 M. What is the value of K c for this reaction? 5. NOCl decomposes according to the following balanced equilibrium reaction: 2 NOCl (g) 2 NO (g) + Cl 2 (g) a. Write out the expression for the equilibrium constant for this reaction in terms of concentrations, K c . Does the expression for Q c for this reaction differ in any way from K c , and if so, how? b.
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EquilibriumWkbk - CHEM 125 Equilibrium Workbook Chpts. 17...

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