homework_452hmwk8 - Homework Set#8(The penultimate set If...

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1 © 2010 Sarah L. Keller Homework Set #8 (The pen ultimate set!) • If you haven’t done Homework 1C yet, don’t forget about it! --------------------------------------------------------------------------------------------------------------- 1) Write your own, original problem for the final exam on the form provided on the last page of this homework (or a form you make yourself). Be sure to include full answers . Make sure it is your own problem, don’t plagiarize! Include any references. Your problem can cover any topic of the material presented all quarter. However, problems about Keq are covered well in other classes, so either choose a different topic or think up a particularly novel Keq problem. Staple your problem page as the first page of your homework (don’t put it at the back). Please write in a dark pencil or black pen. We will scan all student problems and post them as a PDF online to help you study for the final exam. I may appropriate clever problems to use in future exams unless you explicitly request that I don’t. 2) a) What is the maximum number of phases in equilibrium in 1 -component system? How about a 2- component system? Or a 3 -component system? b) Consider a closed room containing air and water vapor. If the air acts as if it is a single component, how many intensive variables (e.g. T, P, x i …) can be independently varied? 3) Consider the dissociation of a gas called “doublium” into “singlium”: doublium (gas) ± 2 singlium (gas) 1 - ² 2 ² The degree of dissociation, ² , is the fraction of doublium molecules dissociated. The partial pressures in terms of the degree of dissociation and the overall pressure, P, are: P singlium = n n total ± ² ³ ³ ´ µ P = 2 · 1 + ± ² ³ ´ µ PP doublium = n n ± ² ³ ³ ´ µ P = 1 ¸ 1 + ± ² ³ ´ µ P a) Find an expression for the equilibrium constant K P in terms of ² and P only. b) At 25˚C, suppose the equilibrium constant for the dissociation is 0.14 at all pressures. Calculate the fraction of doublium molecules dissociated first at a total pressure of 1 atm and then at 5 atm. (Answers: ± 1 atm = 0.18, 5 atm = 0.08) c) Find K x in the two scenarios.
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This note was uploaded on 03/04/2010 for the course CHEM CHEM 452 taught by Professor Robinson during the Winter '09 term at University of Washington.

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homework_452hmwk8 - Homework Set#8(The penultimate set If...

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