Chrysoberyl a semi precious stone it is a source of beryllium and is known as beryllium di-aluminate. A piece was analysed with the following results: 12.7g of beryllium di-aluminate contained 0.9g of beryllium and 5.4g of aluminium. Q. Calculate the the mass of oxygen in the sample of beryllium di-aluminate. And from the abouve answer calculate (i) the mass of the oxygen and, the mass of aluminium that combines with one mole of beryllium atoms and how many moles of aluminium atoms do these masses represent?
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