PS4_Key - Chemistry 2080 Spring 2009 Problem Set#4 due date...

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Chemistry 2080 Spring 2009 Problem Set #4 - due date: Friday, February 20th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ Practice problems (not graded). Chapter 14: 11, 12, 19, 23, 25, 33, 55 also Example 14-5 and the associated Practice Example A, and Example 14-8 and the associated Practice Examples A and B. 1) Here are some rates that were obtained at 298.15K for the reaction: A + B –––––> C Initial Rate of Disappearance of A (M/s) [A] (M) [B] (M) 1) 0.053 0.10 0.50 2) 0.127 0.20 0.30 3) 1.02 0.40 0.60 4) 0.254 0.20 0.60 5) 0.509 0.40 0.30 The concentrations of A and B given above are the starting concentrations. (a) Determine the overall order of the reaction. We will assume that the rate of the reaction can be expressed as: Rate = k[A] x [B] y To solve for x, we can compare experiments (2) and (5): In these two runs, the initial concentration of B is fixed at 0.30 M, but [A] is 0.20 M in (2) and 0.40 M in (5) (i.e. twice as much). However, the rate increased by a factor of 4.0, so x = 2. Similarly, if we compare experiments (2) and (4), [A] is fixed at 0.20 M, while [B] is 0.30 M in (2) but doubled to 0.60 M in (4). The rate increased by a factor of 2.0, so y =1.

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