Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of K = 39, Be = 9, F = 19). Work to one decimal place.

K₃BeF₉

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K₄BeF₂

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KBeF₄

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KBeF₉

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K₂BeF₄

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Solution

The correct option is E
K₂BeF₄

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Q. The empirical formula of a compound containing 47.9 % potassium, 5.5 % beryllium and 46.6 % fluorine by mass is

[At. weight of Be = 9; F= 19; K=39]

(a) Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass (Atomic weight of Be = 9; F = 19; K = 39). Work to one decimal place.
(b) Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120 g of copper oxide? The equation for the reaction is:
3CuO + 2NH₃ $\overset{}{\to}$ 3Cu + 3H₂O + N₂
(Volume occupied by 1 mole of gas at STP is 22.4 litres).

(i) Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of Be = 9; F = 19; K = 39).
(ii) Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120 g of copper oxide?
The equation for the reaction is:
3CuO + 2NH₃ $\overset{}{\to}$ 3Cu + 3H₂O + N₂
(Volume occupied by 1 mole of gas at STP is 22.4 litres).