Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 3 - Stoichiometry - Review Questions - Page 125: 3


No single atom of boron has a mass of its atomic mass ($10.81\space u$) because its atomic mass is just a weighted average of the masses of its isotopes and doesn't have anything to do with the mass of a specific isotope.

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