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PS4 - Chemistry 2080 Spring 2009 Problem Set#4 due date...

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Unformatted text preview: Chemistry 2080 Spring 2009 Problem Set #4 - due date: Friday, February 20th at 2 pm Name: Lab TA Name: Lab Dayfl'ime: 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 Disapmarance ofA(M/51 |A|§M1 |B|(M) 0.053 0.10 0.50 0.127 0.20 0.30 1.02 0.40 0.60 0.254 0.20 0.60 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. (b) Determine the initial rate of disappearance of A when the concentration of A is 0.30 M and that of B is 0.40 M. 2) The following gas—phase reaction was studied at 290°C by observing the change in pressure as a function of time in a constant volume vessel: ClCOZCCl3(g) > 2COC]2(g) Determine the order of the reaction, and the rate constant, based on the following data (P is the total pressure): Time s P (mmHg) 0 15.76 181 18.88 513 22.79 1164 27 .08 You may find the following graphing area useful. 0 200 400 600 300 000 1200 time (seconds) 3) There is an old chemistry “rule” (it’s more of a guideline, really) that if you raise the temperature of a reaction from 25°C to 50°C you will raise the rate by a factor of 10. a) What is the activation energy for a reaction that adheres to this rule? b) Given the activation energy that you calculated in (a), what would be the rate ratio on raising the temperature from 100°C to 125°C? ...
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