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Assignment 3

# Assignment 3 - The phenol concentration and versus time...

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CEE 311 Environmental Engineering Fall 2011 Dr. Kauser Jahan Assignment # 3: Reaction Kinetics Due Sept. 26, 2011 1. The first-order rate constant is 3.4 x 10-3 sec -1 for the decomposition of cyclobutane. What is its half life in minutes? 3.4 What fraction of a sample of cyclobutane remains after 612 seconds? 1/8 2. How long in hours will it take the carbon monoxide concentration in a room to decrease by 99% after the source of carbon monoxide is removed by bringing if fresh air? Assume the first order rate constant for CO removal as 1.2/hr. 3.8 hr 3. Microbial growth follows a first order reaction. A microbial system has an initial cell concentration of 500 mg/L with a growth rate of 0.5/hr. How long in hours will it take for the cell concentration to double? 1.39 hr 4. An experiment was conducted to determine the reaction order and reaction rate for biodegradation of phenol (removal of phenol by bacteria).

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Unformatted text preview: The phenol concentration and versus time data was plotted in as shown below. a) What is the reaction order? First b) What is the value of the reaction rate? -0.0499 Units hr-1 5. A treatability study is run to investigate the rate at which a hazardous chemical X can be treated. The following data were collected at 25 o C. Time (Days) Concentration mg/L 1.0 1 0.81 3 .56 5 .36 7 .22 10 .14 a) Determine the order of the reaction by plotting data using Excel. b) What is the reaction rate? Provide correct units c) What is the half life for the reaction? d) What is the reaction rate at 30 o C if the following relation holds for reaction rates and temperature k T2 = k T1 * Θ (T2-T1) where T1 and T2 are temperatures and k T2 and k T1 is the reaction rate at the two temperatures Θ is a dimensionless temperature coefficient (Ranges from 1.056-1.13) Use Θ =1.1 for this problem...
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