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Unformatted text preview: Printed Name: Problem Score 1 2 3 4 5 Total ChE 330 Final Exam: Winter 2001 Open Book Course Notes, Homework Solutions, and Course Text Only! There are 10 pages including the cover for this exam Write and Sign the Honor Code Signature: 1 Initials: 2 1. Short Answers (30 pts) (5 Points Each) a) On this  diagram indicate which curve corresponds to the larger polymer molecule and locate any critical points. polymer 2 Phase 2 Phase 0.25 Higher MW Lower MW Critical Point Critical Point b) What equation would you use to calculate P sat of toluene at T = 0C? Explain the reason for your choice. Use Antoine equation, most accurate, parameters in the book are valid at this T Shortcut fails a check of T r > . 5 PengRobinson equation is more work for same results Initials: 3 c) What equation of state would you use to calculate Z for ethane at T = 500K and P = 0 . 1MPa? Explain the reason for your choice. Use ideal gas equation or virial as they are simple and this situation is far from the liquidgas transition. Look at T c and P c and the range of validity in equation 6.10 PengRobinson or other cubic equation is of similar accuracy but is much more work. d) I need to know the activity coefficient of ethanol in benzene, describe an experiment that would measure it. Indicate what properties to measure and how the activity coefficient is determined from the data. Measure the concentration in vapor and liquid phases at equilibrium and use modified raoults law to calculate , or measure partition coefficients, solubility, or osmotic pressure Initials: 4 e) Here is a set of calculated from UNIFAC. Which molecule, A or B , is more hy drophobic? Explain the reason for your choice. in water in octanol ln A 11.7333 0.2967 ln B 6.6332 1.4790 Larger is a stronger aversion to that solvent. Both would rather be in the octanol but A has a stronger aversion to water than it does to octanol so it is more hydrophobic....
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