pset3 - diameter of the tube d, the temperature T, and the...

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Chemistry 5.68J Chemical Kinetics Spring Term 2003 Chem. Eng. 10.652J Kinetics of Chemical Reactions Problem Set #3 Due: March 4, 2003 Note: This is a good practice problem for the Hour-and-a-half Exam on March 6 A scientist wants to measure the rate of: C 6 H 5 +C 2 H 4 C 6 H 5 CH 2 CH 2 (reaction 1) She prepares C 6 H 5 by the 248 nm photolysis of C 6 H 5 NO: C 6 H 5 NO + h ν C 6 H 5 +NO (reaction 2) (estimated to be fast (~ 1 ns)) The reverse of reaction 2 has a high rate constant ~10 10 liter/mole s. C 6 H 5 absorbs too weakly to be observed, but fortuitously she observes the visible absorption of C 6 H 5 OO formed by C 6 H 5 +O 2 C 6 H 5 OO (reaction 3) estimated k ~ 10 9 liter/mole s where the O 2 originally came from an air leak in her apparatus. She sets up a new apparatus (no leak this time) that looks like this: Probe Laser Beam (Visible) C 6 H 5 NO O 2 L To exhaust C 2 H 4 Visible 248 nm detector pulses from excimer laser The experimental adjustables are flow distance L, the mass flow rates of each of the 3 input gases, the
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Unformatted text preview: diameter of the tube d, the temperature T, and the pressure P. The measurable is the Intensity of visible laser light measured by the detector. The excimer is firing at a steady rate of 50 pulses per second and its average power of 5 W appears to be constant over the course of the experiment. The incident intensity of the visible (probe) laser beam is also constant in time. Assuming that the system is perfectly 1 dimensional (perfectly mixed in the radial direction), and making any other clearly stated assumptions you think appropriate, write an equation for the variation in the concentration of C 6 H 5 OO at the position of the probe laser beam as a function of L, P, T, and the mass flow rates. Do we have enough information to determine k 1 ? If so, tell how you would determine it from the data you have. If not, tell what additional data you need. How would you carry out the experiments?...
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pset3 - diameter of the tube d, the temperature T, and the...

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