(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 → 3Cu + 3H2O + N2(Volume occupied by 1 mole of gas at STP is 22.4 litres).

(a) Determine the empirical formula of a compound containing 47.9% pot

1.	(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 → 3Cu + 3H2O + N2(Volume occupied by 1 mole of gas at STP is 22.4 litres).
Answer» (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).