ap07_chemistry_form_b_sgs_final_complete

095 mol ne 22 1 mol ne 22 2018 g ne 1 mol ne 36 1022

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Unformatted text preview: e the number of Ne-22 atoms in a 12.55 g sample of naturally occurring neon. 23 12.55 g Ne × 6.022 ×10 Ne-22 atoms 1 mol Ne 0.095 mol Ne-22 × × 1 mol Ne-22 20.18 g Ne 1 mol Ne = 3.6 × 1022 Ne-22 atoms One point is earned for the correct molar mass. One point is earned for the correct fraction of Ne-22 in Ne. One point is earned for the number of atoms. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). AP® CHEMISTRY 2007 SCORING GUIDELINES (Form B) Question 2 (continued) (b) A major line in the emission spectrum of neon corresponds to a frequency of 4.34 × 10−14 s−1. Calculate the wavelength, in nanometers, of light that corresponds to this line. c = λν λ= ⇒ λ= 8 3.0 × 10 m s −1 14 −1 4.34 × 10 s c ν × One point is earned for the correct setup. 1 nm 10− 9 m = 690 nm One point is earned for the answer. (c) In the upper atmosphere, ozone molecules deco...
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