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HW2ME525SP2011

HW2ME525SP2011 - 1 ME 525 Homework#2 Due Tuesday February 8...

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1 ME 525 Homework #2 Due Tuesday, February 8, 2011 Prof. Lucht (E-mail address: [email protected]) 1. Turns, Problem 4.10. 2. The decomposition of ozone (O 3 ) can be modeled as the following sequence of elementary reactions: 1 3 2 10 2 3 2 2 10 3 log 14.63 , 0 , 22.18 log 13.06 , 0 , 4.57 [ ] A A kcal k O M O O M A b E gmol kcal k O O O O A b E gmol A cm gmol s   (a) Calculate the rate constants for the two forward reactions as written above at a temperature of 800 K. (b) Write a differential equation for the change in [O] with respect to time and solve the equation for the case of constant ozone and diatomic oxygen concentrations. Neglect reverse reactions. (c) Calculate the steady-state concentration of O atoms in a gas mixture with a temperature of 800 K, a pressure of 2 atm, and mole fractions (initially) of 0.2 for ozone and 0.8 diatomic oxygen. Neglect reverse reactions. (d) Based on your answer to part (c), at what rate in gmol/(cm 3 -sec) does the ozone
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