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2007 Fall midterm 2 - 2100 exam II page 1/12 ChBE 2100...

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_____ 2100 exam II page 1/12 ChBE 2100 Chemical Process Principles Fall 2007 Exam II October 11, 2007 There are 4 problems, each worth 25 points. There are some tables at the end of the exam that you may find useful. Please read the questions carefully. This exam is closed-book. However, you are allowed one 8.5" x 11" piece of paper (one side only) with any information you want on it. These notes must be your own and may not be copied from another person. All other relevant information is provided. The use of wireless devices (e.g. cell phones, IR transmitters/receivers) is not permitted. The use of programmable calculators is only allowed if all relevant content has been erased from the calculator memory. To receive full credit on each problem, it is advised to start with the appropriate full form of the balance equation{s) needed to solve the problem. label all variables and equations. Include a brief word description to explain each step in your problem if appropriate. State all your assumptions clearly. Present your solution clearly. Numerical answers without units or explanations will not receive credit. Name: _ (Please write your name on the back of the last page of the exam too) Section (circle one): gAM (Prausnitz) or 10AM (lu) The work presented here is solely my own. I did not receive any assistance nor did I assist other students during the exam. I pledge that I have abided by the above rules and the Georgia Tech Honor Code. Signed: _ Problem I ____ ~/25 Problem II ____ ~/25 Problem III ____ ---'/25 Problem IV ____ ---'/25 Total ./100
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2100 exam II page 2/12 Problem I (25 points) a. (3 points) A sealed vessel contains only acetone. Identify which phase(s) can be present for the following situations (circle the correct answer(s». The pressure is slightly less than the vapor pressure. liquid gas/vapor The pressure equals the vapor pressure. liquid gas/vapor The pressure is slightly more than the vapor pressure. liquid gas/vapor lJ,'~ I "J~ b. (3 points) A sealed vessel contains only acetone and helium. Identify which phase(s) ca:e preser for the following situations (circle the correct answer(s». There are 5 degrees of superheat. liquid gas/vapor The vapor phase is saturated. liquid gas/vapor The pressure is slightly less than the vapor pressure of acetone liquid gas/vapor N' I "/t~ ~ I f\IG c. (3 points) After an ice storm (in other parts of the country), salt is poured onto the Ice. Sin p s from this class, explain why salt helps make the ice melt faster in 1 or 2 sentences.
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2100 exam II page 3/12 d. (16 points) You have a sealed vessel at equilibrium at 1 atm and 80 °C. Answer the following questions and be sure to show/explain your work when quantitative answers are needed. The vessel contains only water. Is there a liquid phase present? Yes No If yes, what is the composition of the liquid phase (i.e., mole fractions of each species)?
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