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Unformatted text preview: ege Board. PSAT/NMSQT is a registered trademark of the College Board and National Merit Scholarship Corporation. Permission to use copyrighted College Board materials may be requested online at: www.collegeboard.com/inquiry/cbpermit.html. Visit the College Board on the Web: www.collegeboard.com. AP Central is the official online home for the AP Program: apcentral.collegeboard.com. AP® CHEMISTRY 2007 SCORING GUIDELINES (Form B) Question 1 A sample of solid U3O8 is placed in a rigid 1.500 L flask. Chlorine gas, Cl2(g), is added, and the flask is heated to 862°C. The equation for the reaction that takes place and the equilibrium-constant expression for the reaction are given below. ( pUO2 Cl2 )3 ( pO2 ) 3 UO2Cl2(g) + O2(g) U3O8(s) + 3 Cl2(g) Kp = ( pCl2 )3 When the system is at equilibrium, the partial pressure of Cl2(g) is 1.007 atm and the partial pressure of UO2Cl2(g) is 9.734 × 10− 4 atm. (a) Calculate the partial pressure of O2(g) at equilibrium at 862°C. U3O8(s) + 3 Cl2(g) I C E --- 3 UO...
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.

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