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Unformatted text preview: Department of Chemical Engineering ChE 110A University of California, Santa Barbara Winter 2010 Problem Set No. 3 Due: Wednesday, January 20, 2010 Objective : To understand and perform calculations using the First Law of Thermodynamics, and to assess system energy flows in closed systems. Note: Numerical values for some problems have been changed from those in the book. Problem 7 (thought problem) A friend claims that the work required to compress steam, in general, can be evaluated by looking up enthalpy and other property values before and after the compression in tables (e.g., the steam tables at the back of your book). What is wrong with this assessment? What if the compression is known to be isobaric, specifically? Problem 8 ( Smith, van Ness, Abbott, 2.9, page 57 - modified) A system comprised of chloroform and ethanol exists as a two-phase vapor/liquid system at 50 g and 55 G¡¢ . The mole fraction of ethanol is notably higher in the liquid phase than in the gas phase. It is found, after the addition of some pure ethanol, that the system can be returned...
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This note was uploaded on 03/14/2010 for the course CH E 110a taught by Professor Shell during the Winter '10 term at UCSB.
- Winter '10