Chemistry: The Central Science (13th Edition)

by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.

Published by Prentice Hall

ISBN 10: 0321910419

ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.33b

Answer

This is not the atomic mass of an individual isotope, but rather is the average mass of boron isotopes.

Work Step by Step

An individual isotope of boron will have a mass that is a whole number. However, when the atomic mass of boron is reported as 10.81 amu, this number does not represent the atomic mass of one boron isotope but rather the average mass of all boron isotopes.

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