Answer
154 amu
Work Step by Step
The mass number is equal to the number of protons plus the number of neutrons:
$=63+91=154$
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 2 - Chemical Compounds - Summary Problem - Part I - Page 88: c
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