Answer
$15.9993 u $
Work Step by Step
The molar mass is given by the weighted average of the masses of the isotopes, weighted by their abundances.
$15.9949\times0.99763+16.9991\times0.000375+17.9991\times0.001995 = 15.9993 u $
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - 2-5 The Periodic Table - Case Study - Questions - Page 53: 2
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