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Unformatted text preview: How much heat per mole do we need? (Neglect any phase transitions in your calculations.) 3. (From 2010 Midterm 2) (a) Write down one version of the second law. (b) What is adiabatic? (c) Dene eciency for a heat engine. (d) Dene heat of formation. 4. (From 2009 Midterm 2) Assume a gas can be described by the following equation of state pV NRT = 1 + ap 2 + b p with a = 7 10-11 1 mole Pa 2 and b = 0 . 21 Pa mole . (a) Calculate the work required (for one mole at 300 K) to increase the pressure from 50 to 200 kpa. (b) Calculate the volumes for the initial and nal state of part (a). Appendix: H f (H 2 O, 298K) = -286 kJ/mol H f (HCl, 298K) = -92 kJ/mol The heat capacities can be expressed as c P R = A + BT + CT 2 + D T 2 with A 10 3 B K C DK 2 10 5 HCl 3.2 0.6 0.15 O 2 3.6 0.5-0.23 H 2 O 3.5 1.5 0.12 Cl 2 4.4 0.09-0.34 The gas constant is 8.314472 J/(mol*K)...
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- Fall '09