Homework 17 Key

Homework 17 Key - g NO H g O H g O H g NO H H f f f f rxn /...

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CHEM 1515 Homework 17 Key End-of-Chapter Problems
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Review and Discussion Questions 3. The equilibrium constant for equation 12 would be: 6 2 4 2 2 3 H N NH p p p p K = Plugging in the values from table 3 gives K’ p = 3.7 x 10 11 (3.7 x 10 11 through 3.9 x 10 11 , depending on which data set you use). Notice that K’ p written this way is equal to K p 2 (where K p is the equilibrium constant determined in the text). Substituting in K p 2 for K’ p we see that we get the same expression as shown in the text. 5. To answer this question, we need to determine whether the reactions are endothermic or exothermic. We can do this by using heats of formation from Appendix B in the textbook to determine rxn H Δ . a. () () ( ) ( ) ( ) ( ) () () mol kJ mol kJ mol kJ mol kJ g O H g CO H g CO H H f f f rxn / 0 . 570 / 0 / 5 . 110 2 / 5 . 395 2 2 2 2 2 = = Δ Δ Δ = Δ This is exothermic, and so increasing the temperature will shift the equilibrium towards reactants. b. () () ( ) ( ) ( ) ( )( ) ( ) () ( ) ( ) mol kJ mol kJ mol kJ mol kJ mol kJ
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Unformatted text preview: g NO H g O H g O H g NO H H f f f f rxn / 200 / 29 . 90 / 143 / / 2 . 33 3 2 2 = + = + = This reaction is exothermic, so increasing the temperature will shift the equilibrium toward the reactants. c. ( ) ( ) ( ) ( ) ( ) ( ) mol kJ mol kJ mol kJ g O H g O H H f f rxn / 286 / 143 2 / 3 2 3 3 2 = = = This reaction is exothermic, so increasing the temperature will shift the equilibrium toward the reactants. 7. a. Decreases amount of products. b. No effect. c. Decreases amount of products. d. Increases amount of products. e. Poorly specified question; the reactants will continue to react to make products. However, because the overall pressure is going down as the reactants are consumed, the amount of products in the reaction mixture will go down. Challenge Questions...
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This note was uploaded on 01/08/2012 for the course CHEM 1515 taught by Professor White during the Fall '11 term at Oklahoma State.

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Homework 17 Key - g NO H g O H g O H g NO H H f f f f rxn /...

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