Exam 1 F12 - ChE 381 Exam 1 Page 1 of 6 I understand that...

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ChE 381 Exam 1 September 14, 2012 Page 1 of 6 Your Initials: I understand that academic integrity is expected of all Iowa State University Students and I pledge that I have neither given nor received unauthorized aid on this examination. Name (print) __________________________ Signature_____________________________ Date____________
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ChE 381 Exam 1 September 14, 2012 Page 2 of 6 Your Initials: 1. 35 points total Carbon dioxide gas is compressed from 200K, 1.0 bar to 500K, 10.0 bar in 2-steps: an isothermal process followed by an adiabatic process. Assume ideal gas behavior. C p,CO2 /R = 5.457 T c,CO2 = 304.2K P c,CO2 = 73.83 bar CO2 = 0.224 Find Q and W for this process. (25 points)
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ChE 381 Exam 1 September 14, 2012 Page 3 of 6 Your Initials: 1. (cont) Your colleague has suggested an isobaric process followed by an isochoric process. Without calculating Q or W, estimate whether the work requirement for this process will be greater than, less than, or roughly equal to the process described above. Justify your answer. (10 points)
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ChE 381 Exam 1 September 14, 2012 Page 4 of 6 Your Initials: 2. 35 points A stream of n 1 mol/s nitrogen gas at T N
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