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Unformatted text preview: March, 2009 1 Name: PRACTICE EXAM II 1 . The following plot shows the change in concentration of nitrosyl bromide, NOBr, with time, for the reaction: 2 NOBr(g) 4 2 NO(g) + Br2(g). Note that [NOBr]0 = 1.60 x 10-3 mol/L. 1.8 1.6 1.4 1.2 g ; 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 16 tim e m in) (a) Explain how you can tell from the plot that the reaction is 2 nd order in [NOBr]. (b) What other graph could you plot to prove that this reaction is 2 nd order in [NOBr]? What would you plot on each of the axes, and what would the graph look like? (c) Use the above plot to determine the approximate instantaneous rate of decomposition of NOBr at t = 1.00 min. Show your work. (d) Is the initial rate of decomposition of NOBr greater or less than the rate at t = 1.00 min? March, 2009 2 Name: (e) What is the rate of formation of Br2 at t = 1.00 mm? (f) Calculate the rate constant, and include the units. (g) Calculate the concentration of the nitrosyl bromide after 20.0 mins. 2. The reaction: 2 NO + 0 2 4 2 N O 2 was found to be rd order in [NO] and l st order in . Use this information to complete the following data table. Show or explain your work below the table.information to complete the following data table....
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This note was uploaded on 03/26/2011 for the course CHEM 1032 taught by Professor Guenard during the Spring '06 term at Temple.
- Spring '06