Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 2 - Sections 2.1-2.9 - Exercises - Problems by Topic - Page 81: 77

Answer

Br-79: 78.919amu, 50.69% abundance.

Work Step by Step

Natural Abundance: The total abundance will equal 100%, so 100-49.31= 50.69% We know the mean value of the mass is 79.904. We know the abundance of both isotopes and the mass of Br-81. 79.904amu=(80.9163)(0.4931)+(mass of Br-79)(0.5069) mass of Br-79= 78.919amu
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