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Workshop #2 Key

Workshop #2 Key - Names Everybody in your group must sign...

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Names____________________________________________________________ Everybody in your group must sign their own name. Chem. 104LC Workshop 2 (20 points) Summer 2010 Kinetics and Equilibrium 1. The kinetics of the decomposition of dinitrogen pentoxide to nitrogen dioxide and oxygen was studied at 298 K by measuring the decay of the dinitrogen pentoxide as a function of time. The graph of the decomposition is shown below: a. (5 pts) From the graph, it was determined that the initial rate was 6.11 x 10 -4 Ms -1 . Estimate the rate when the concentration of the dinitrogen pentoxide is 0.40 M. N 2 O 5 2NO 2 + ½ O 2 At 0.9 M initial rate is 6.11x10 -4 0.9/0.4 = 6.11x10 -4 / x x = 2.7 x10 -4 M/s Decay of Dinitrogen pentoxide at 298 K 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 200 400 600 800 1000 1200 1400 1600 1800 2000 time (s) conc (M)

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b. (2 pts) Use your data from part a) above to determine the rate law for the reaction. Clearly demonstrate how you are computing the rate [N 2 O 5 ] (M) Rate (M/s) 0.9 6.11x10 -4 0.4 2.7 x10 -4 6.11x10 -4 /2.7 x10 -4 = [0.9/0.4] n 2.18 = 2.25 n n=1 Rate = k [N 2 O 5 ] 1 c. (2 pts) Determine the rate constant for this reaction at 298 K.
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Workshop #2 Key - Names Everybody in your group must sign...

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