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Unformatted text preview: HW15 (Homework) BARAKAT FARRIS CH101, section 003, Fall 2008 Instructor: Lori Petrovich Web Assign Current Score: 4.8 out of 5 Due: Friday, October 24, 2008 11:59 PM EDT Description REMINDER: EXAM 3 IS MONDAY, OCTOBER 27, 2008. Title: Equilibrium, LeChatelier's Principle, and Kinetics Chapter 9 Reaction Energetics Sections 9.9-9.12 Chapter 9 Study Sheet Instructions The question submission scoring is as follows: Correct on first submission: full points Correct on second submission: full points Correct on third submission: full points Correct on fourth submission: 90% of points Correct on fifth submission: 80% of points Do NOT press 'submit all questions" when you are finished. This will do exactly as indicated, and submit all questions, reducing your score. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 0.5/0.5 points | 1/5 submissions Determine the value of the equilibrium constant (report your answer to three significant figures) for the following reaction if an equilibrium mixture contains 0.010 mol of solid PbI 2 , and is 0.0100 M in Pb 2+ ions and 0.00081 M in I 1- ions. Use the notation 4.31e-5 to indicate a number such as 4.31 x 10-5 . PbI 2 (s) Pb 2+ (aq) + 2I 1- (aq) K = 6.561e-9 6.561e-09 HW15 http://www.webassign.net/v4cgifbaraka@ncsu/student.pl?f=20... 1 of 7 12/14/08 3:09 AM 2. 0.5/0.5 points | 1/5 submissions The following equilbrium partial pressures were measured at some temperature: NH 3 N 2 H 2 0.280 atm 0.170 atm 0.230 atm Determine the value of the equilibrium constant at the temperature of the reaction for the following reaction....
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