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Unformatted text preview: 1 Chapter 12 Web Quiz Worked Solutions 1. A firstorder reaction is 40.% complete at the end of 50. minutes. What is the value of the rate constant (in min1 )? A. 1.8 x 102 B. 1.0 x 102 C. 1.2 x 102 D. 8.0 x 103 2. At a particular temperature, N 2 O 5 decomposes according to a firstorder rate law with a half life of 3.0 s. If the initial concentration of N 2 O 5 is 1.0 x 10 16 molecules/cm 3 , what will be the concentration in molecules/cm 3 after 10.0 s? A. 9.9 x 10 14 B. 1.8 x 10 12 C. 7.3 x 10 9 D. 6.3 x 10 3 E. 9.4 x 10 2 2 3. Consider the reaction 3A + B + C D + E where the rate law is defined as  [A] / t = k [A] 2 [B][C] An experiment is carried out where [B] = [C] = 1.00 M and [A] = 1.00 x 104 M. After 3.00 minutes, [A] = 3.26 x 105 M. The concentration of C after 10.0 minutes is A. 1.10 x 105 M B. 0.330 M C. 0.100 M D. 1.00 M 4. For the reaction 2N 2 O 5 ( g ) 4NO 2 ( g ) + O 2 ( g ), the following data were collected: t (minutes) [N 2 O 5 ](mol/L) 0 1.24 x 102 10. 0.92 x 102 20. 0.68 x 102 30. 0.50 x 102 40. 0.37 x 102 50. 0.28 x 102 70. 0.15 x 102 The concentration of O 2 at t = 10. minutes is 3 5. For the reaction 2N 2 O 5 ( g ) 4NO 2 ( g ) + O 2 ( g ), the following data were collected: t (minutes) [N 2 O 5 ](mol/L) 0 1.24 x 102 10. 0.92 x 102 20. 0.68 x 102 30. 0.50 x 102 40. 0.37 x 102 50. 0.28 x 102 70. 0.15 x 102 The halflife of this reaction is approximately A. 15 minutes B. 18 minutes C. 23 minutes D. 36 minutes E. 45 minutes 6. If the reaction 2HI H 2 + I 2 is second order, which of the following will yield a linear plot?...
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This note was uploaded on 10/20/2009 for the course CHEM 105BLG taught by Professor Parr during the Spring '08 term at USC.
 Spring '08
 Parr
 Chemistry

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