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Unformatted text preview: ege Board. PSAT/NMSQT is a registered trademark of the College Board and National Merit Scholarship Corporation. All other products and services may be trademarks of their respective owners. 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 online home for AP teachers: apcentral.collegeboard.com. AP® CHEMISTRY 2008 SCORING GUIDELINES (Form B) Question 1 Answer the following questions regarding the decomposition of arsenic pentafluoride, AsF5(g) . (a) A 55.8 g sample of AsF5(g) is introduced into an evacuated 10.5 L container at 105°C. (i) What is the initial molar concentration of AsF5(g) in the container? mol AsF5 = 55.8 g AsF5 × 1 mol AsF5 = 0.328 mol 169.9 g AsF5 One point is earned for the correct molar mass. One point is earned for the correct concentration. 0.328 mol AsF5 = 0.0313 M [AsF5]i = 10.5 L (ii) What is the initial pressure, in atmospheres, of the AsF5(g) in th...
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