2. Analysis of a compound of potassium and oxygen (an oxide of potassium) shows that it contains 3.9 g of potassium (K) and 0.8 g of oxygen (O). (Ar values: K= 39, O = 16) ( 4 marks)
a) Calculate the number of moles of K and the number of moles of O
b) Calculate the empirical formula of the compound.
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