Answer
$78\%$
Work Step by Step
Atomic weights (g/mol): $Na: 22.990,\ K: 39.098$
In 100.0 mol:
Na: $32\ mol\times22.990\ g/mol=740\ g$
K: $68\ mol\times 39.098\ g/mol=2700\ g$
Total mass: $3440\ g$
Mass percent of K: $2700/3440\times100\%=78\%$
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 95g: 110
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