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Key Prob Set 4 09-106 S 11 - Name Recitation(CIRCLE ONE TA...

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1 Name ______________________________ _ 09-106 Spring 2011 Recitation ( CIRCLE ONE TA and ONE TIME ): Christian Steve Brendan 6:30 7:30 Problem Set 4 DUE Tues. 3/15 by 6 PM at DH 2114 (20 points) Part I Problems 1. (a) If both elementary steps are fast , derive a rate law consistent with this mechanism. ( Part (b) is on the next page. As for equilibrium expressions, pure (l) and (s) do not appear in rate laws)
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2 (b) The rate law for the above reaction was determined experimentally as rate = k [HSO 3 - ][H 2 O 2 ] Under what conditions would the above mechanism be consistent with this rate law? 2. For each letter state whether the equilibrium shifts left, right, or not at all .
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3 3. NOTE: This problem has 3 parts [(a)-(c)] that continue throughout the next page. (a) The following reactions have the following data: k 1 k 2 (NH 4 ) 2 S (s) barb2right 2 NH 3 (g) + H 2 S(g) 2 NH 3 (g) + H 2 S(g) barb2right (NH 4 ) 2 S (s) A = 0.500, E a = 100.0 kJ/mol, T = 650 K A = 0.750, E a = 160.0 kJ/mol, T = 650 K (a) Calculate K for the single step equilibrium reaction: (NH 4 ) 2 S (s) barb2leftbarb2right 2 NH 3 (g) + H 2 S(g).
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