Answer
$1.333$
Work Step by Step
Since the mass of $^{12}C$ is 12u by definition:
the relative mass of O to $^{12}C$ is $15.995/12=1.333$
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 - Study Questions - Page 95a: 13
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