2300_les18

2300_les18 - VI Entropy G Entropy Change of a Pure...

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1 lesson 18 VI. Entropy G. Entropy Change of a Pure Substance 1. T-s diagram for a pure substance T s s g s f P = constant Sat. liq. line Sat. vap. line f g fg s s s = lesson 18 VI. Entropy 2. Tabular entropy data a. Superheated vapor: s from table b. Saturated liquid: s = s f c. Saturated mixture: s = s f + xs fg = (1 - x)s f + xs g d. Compressed liquid: s(T,p) s f at T 3. Entropy change: S = m s = m(s 2 -s 1 ) (7-12)
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2 lesson 18 VI. Entropy 4. Example. The piston-cylinder device shown below contains 1.00 kg of water at 150 C and 100 kPa. The piston is frictionless and weightless. We now add 50 kJ of heat to the water. Find the increase in u, h, and s for the water. How much work is done by the water? Sketch the process on a T-s diagram. 1.00 kg H 2 O (system) T 1 = 150 C T 2 = ? C P 1 = P 2 = 100 kPa Q in = 50 kJ 1 kg H 2 O 100 kPa lesson 18 VI. Entropy a. assume heat capacity of piston and cylinder are negligible, KE and PE are negligible, and that expansion is quasi-equilibrium.
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This note was uploaded on 09/04/2009 for the course CHEM 2300 taught by Professor Thermo during the Summer '08 term at Utah.

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2300_les18 - VI Entropy G Entropy Change of a Pure...

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