Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - Study Questions: 156

Answer

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Work Step by Step

a) 158 peak: $^{79}Br_2$; 160 peak: $^{79}Br^{81}Br$; 162 peak: $^{81}Br_2$; b) Since both isotopes have a relative abundance of roughly 50%, the peaks are proportional to the number of possible combinations between them. The 160 peak has two possible combinations ($^{79}Br^{81}Br$ and $^{81}Br^{79}Br$) vs one for each of the other two, which explains the ratio of intensities of the peaks (1:2:1).
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