Answer
12 amu, in the book carbon is listed as having an atomic mass of 12.01 amu, because another stable isotope (carbon-13) exists.
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Chemistry 12th Edition
by Chang, Raymond; Goldsby, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0078021510
ISBN 13:
978-0-07802-151-0
Chapter 3 - Mass Relationships in Chemical Reactions - Questions & Problems - Page 106: 3.2
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