## Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning

# Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95g: 110

#### 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: $2700/3440\times100\%=78\%$

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