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  1. Determine the empirical formula of a compound containing 47.9% potassium, 5.5.% beryllium and 46.6% fluorine by mass. 

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Element Percentage composition Atomic weight  Relative No. of atoms   Simplest ratio
Potassium              47.9     39  47.9/39 = 1.21.2/0.6 = 2
Beryllium         5.5      9  5.5/9 = 0.60.6/0.6 = 1
Fluorine         46.6                       19  46.6/19 = 2.42.4/0.6 = 4

Hence, empirical formula is K2BeF4.

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