General Chemistry (4th Edition)

Published by University Science Books
ISBN 10: 1891389602
ISBN 13: 978-1-89138-960-3

Chapter 2 Atoms and Molecules - Problems: 53

Answer

(Isotopic Mass of Br-79)(Abundance of Br-79) + (Isotopic Mass of Br-81) (Abundance of Br-81) = Atomic Mass of Bromine Suppose x = Abundance of Br-79 This implies that Abundance of Br-81 = 1-x Therefore (78.9183) (x) + (80.9163)(1-x) = 79.904 78.9183x + 80.9163 – 80.9163x = 79.904 -1.998x = -1.0123 x = 0.50667 1-x = 1 - 0.5067 1-x = 0.4933 Hence %age of Br-79 = 50.667% And %age of Br-81 = 49.33%

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