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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) Deﬁne eﬃciency for a heat engine. (d) Deﬁne 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 ﬁnal state of part (a). Appendix: Δ H f (H 2 O, 298K) = -286 kJ/mol Δ 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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This note was uploaded on 11/12/2011 for the course ECH 152A taught by Professor Faller during the Fall '09 term at UC Davis.
- Fall '09