Answer
Hf
Work Step by Step
Mass fraction of O: $15.2/100=2\times15.999\div(x+2\times15.999)$
Solving for x:
$x=178.52\ g/mol$
This atomic weight is closest to Hafnium's.
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 95i: 144
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