# CHM ENG 142 Midterm: 142 Second Midterm 2020 final version (1)

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Published on 10 May 2020
School
Berkeley
Department
Chemical and Biomolecular Engineering
Course
CHM ENG 142
Professor
NAME: _________________________________________
Chemical Engineering 142
Second Midterm Exam (Spring 2020)
April 17, 2020
Open book and notes, calculating devices, internet access disabled
Problem 1 (35 points) ________________
Problem 2 (30 points) ________________
Problem 3a (15 points) ________________
Problem 3b (15 points) ________________
Problem 3c (15 points) ________________
TOTAL (110 points) ________________
I hereby certify that the solutions I am turning in for this exam are entirely
my own work and that I have not used internet materials or other students to
help me solve these exam problems.
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## Document Summary

Open book and notes, calculating devices, internet access disabled. I hereby certify that the solutions i am turning in for this exam are entirely my own work and that i have not used internet materials or other students to help me solve these exam problems. Methanol is produced from methane and water via the following set of elementary steps: H2o + 2 * h* + oh* Ch4 + 2 * ch3* + h* Ch3* + oh* ch3oh + 2 * Quasi-equilibrated: derive an expression for the rate of methanol formation as a function of rate constants, concentrations of gas-phase species, and total surface sites (l). (10 points, simplify the rate given that step 2 is quasi-equilibrated. Based on these expressions, qualitatively plot the dependence of the rate on the concentration of ch4 at a constant concentration of h2o. (10 points)