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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