Wksht05 - 2 O(g Dessicant(s H 2 O(g Hydrated Solid heat Co 2(s n H 2 O(g Co(OH 2 n 2(s heat 4 Equilibrium Constants Change with Temperature t he

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CHM 2046/Myers Worksheet 5 January 13, 2010 1. Equilibrium Shifts Resulting from a Change in Total Pressure . The point here is that the statement of the question can be a little vague. (Really??) Just interpret the problem carefully as to how the pressure is raised. Equilibrium: 3 H 2 (g) + N 2 (g) 2 NH 3 (g) + heat Change Applied Shift Notes decrease V (at constant T) add H 2 or N 2 add NH 3 raise T (at constant V) add Argon (at constant V) 2. Combined Effects of Kinetics and Equilibrium for Some Important Reactions. (a) Equilibrium : 3 H 2 (g) + N 2 (g) 2 NH 3 (g) + heat At low T , K > 1 but the rate is very slow , so essentially no product is obtained. At high T , the rate is OK, but the equilibrium shifts left and K < 1. So the yield is poor . What can be done?? (b) Equilibrium: heat + N 2 (g) + O 2 (g) 2 NO(g) At low T, K <<1 and also the rate is very small. At high T, K < 1 and the rate is fast. A “small” but significant concentration of NO (an air pollutant) is formed. What can be done?? 3. An Application of the LCP: A Dessicator and its Co +2 indicator for H
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Unformatted text preview: 2 O(g). Dessicant(s) + H 2 O(g) Hydrated Solid + heat Co +2 (s) + n H 2 O(g) Co(OH 2 ) n +2 (s) + heat 4. Equilibrium Constants Change with Temperature: t he van’t Hoff Equation : ⋅-= -= ∆ ∆ T T T T R H T T R H K K ln 1 2 1 2 rxn 2 1 rxn 1 2 1 1 The Clausius-Clapeyron Equation is a “special case” of the van’t Hoff Equation. 5. The Relationship of Rate k’s to the Equilibrium K For A + 2 B 2 C + D , assume simple, single step mechanisms, both ways. The rate laws are: Rate – forward reaction = Rate – reverse reaction = At equilibrium, (Rate – forward) = (Rate – reverse). Substituting from the rate laws: Factor the constants to the left and the variables to the right. 6. Converting Kp and Kc. Use PV = nRT with R = 0.08206 K mole atm L Problem: Find Kp for 3 H 2 (g) + N 2 (g) 2 NH 3 (g) if Kc = 0.52 at 400 °C. Kp = _____________...
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This note was uploaded on 05/30/2010 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Wksht05 - 2 O(g Dessicant(s H 2 O(g Hydrated Solid heat Co 2(s n H 2 O(g Co(OH 2 n 2(s heat 4 Equilibrium Constants Change with Temperature t he

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