Quiz2A_key

Quiz2A_key - Chem 125 Winter 2008 Quiz #2 Clinton Dr....

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Chem 125 Quiz #2 Clinton Dr. Retsek Winter 2008 NAME: ____ KEY ____________________________ 1. (6 points) For the reaction X + Y Z the following initial rate data were collected at constant temperature. Trial [X], M [Y], M Rate, M min -1 1 0.10 0.50 0.053 2 0.20 0.30 0.127 3 0.40 0.60 1.02 4 0.20 0.60 0.254 5 0.40 0.30 0.509 a. Write the correct rate law for this reaction. _ rate = k[X] 2 [Y] _______________ You must show or explain how you determined at least one of the orders in order to receive full credit. Pick two trials where one of the concentrations is constant: Rate 2 = k[X] 2 m [Y] 2 n = 0.127 = k[.20] m [0.30] n 0.5 = (0.5) n n = 1 Rate 4 = k[X] 4 m [Y] 4 n 0.254 k[.20] m [0.60] n Compare trials 3 and 4 to find “m” Rate 3 = k[X] 3 m [Y] 3 n = 1.02 = k[.40] m [0.60] n 4 = (2) m m = 1 Rate 4 = k[X] 4 m [Y] 4 n 0.254 k[.20] m [0.60] n b. What is the correct value for the rate constant (include units)? Pick any row of data and solve for k:
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This note was uploaded on 04/02/2008 for the course CHEM 125 taught by Professor Retsek during the Winter '08 term at Cal Poly.

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Quiz2A_key - Chem 125 Winter 2008 Quiz #2 Clinton Dr....

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