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1aa3-2012-tut6-q - CHEMISTRY 1AA3 Week of TUTORIAL PROBLEM...

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CHEMISTRY 1AA3 Week of FEBRUARY 13, 2012 TUTORIAL PROBLEM SET 6 ______________________________________________________________________________ Page 1 of 7 Kinetics questions: 1. The combination of CF 3 "free radicals", 2 CF 3 C 2 F 6 , occurs with rate constants of 5.9 10 9 M 1 s 1 at 25 C and 7.1 10 9 M 1 s 1 at 60 C. (a) Use the Arrhenius equation for the rate constant as a function of temperature to obtain the activation energy. (b) At a certain temperature the product can be condensed to a liquid. The rate constant at this temperature is 2.30 10 9 M 1 s 1 . Determine the temperature, in degrees Celsius, at which this rate constant applies. 2. A reaction has an activation energy of 42.6 kJ/mol and a rate constant of 0.045 s -1 at 25.0 o C. At what temperature will the reaction rate quadruple? a. 74.2 o C b. 121.5 o C c. 51.1 o C d. 32.7 o C e. 65.3 o C IMF questions: 3. How does each of the following affect the rate of evaporation of a liquid in an open dish? (a) Intermolecular forces (b) Temperature (c) Surface area
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