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in CBSE by (128 points)

  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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1 Answer

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Element  Percentage composition  Atomic weight   Relative No. of atoms    Simplest ratio
Potassium               47.9      39   47.9/39 = 1.2 1.2/0.6 = 2
Beryllium          5.5       9   5.5/9 = 0.6 0.6/0.6 = 1
Fluorine          46.6                        19   46.6/19 = 2.4 2.4/0.6 = 4

Hence, empirical formula is K2BeF4.

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