che320_class4edited

che320_class4edited - Entropy change of an ideal gas 1 mol...

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4 Thermo review problems today . entropy increase entropy change of an idea gas or water virial equation announce . Review session Mon 31aug2009 4 pm. No class Mon 07sep2009 (Labor Day). 1 st exam (8 am on Fri 18sep2009, 111 Wartik). 1 Midterm exam Mon 05oct2009 from 8:15-11:15. assignments . HW 01 due before class Wed 02sep2009. reading: Ch 02
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Example. Entropy increase A 40 kg steel casting (C p = 0.5 kJ/kg-K) at 450 C is quenched in 150 kg of oil (C p = 2.5 kJ/kg-K) at 25 C. If the total system is adiabatic, what is the change in entropy of a) the steel casting, b) the oil, and c) the sum of the two? 2
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Opinion Box Take out a sheet of paper. Keep your paper anonymous, without your name. Let me know … What made sense? What was confusing? 4 Questions? Technical? Center? Personal? Fun? Suggestions? Comments?
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Example. Entropy change of an ideal gas 1 mol of O 2 gas goes from T = 320 K and p = 1.6
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Unformatted text preview: Entropy change of an ideal gas 1 mol of O 2 gas goes from T = 320 K and p = 1.6 bar to T = 410 K and p = 3.4 bar. What is the change in entropy and internal energy? How would this change for a real gas? 5 blank 6 blank 7 blank 8 blank 9 blank 10 Story CENTER: Character C haracter E xcellence Ow n ership nacity 11 T enacity E ntrepreneurship R elationship Example. Gas pressure by virial equation We have 3.0 mol of iso-propanol vapor at 200 C in 4,000 cm 3 of volume. Experimental values for the virial coefficients of the vapor at 200 C are B = -388 cm 3 /mol and C = -26,000 cm 6 /mol 2 . Find the pressure for a) an ideal gas, b) a real gas with the virial equation Z = 1 + B/V + C/V 2 . 12 blank 13 Summary Calculus helps us with thermo! 14 C haracter E xcellence Ow n ership T enacity E ntrepreneurship R elationship Character....
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