What is the percentage of aluminium in `Al_(2)O_(3)`? `(Al = 27, O = 16)`

Aluminium oxide, Al_(2)O_(3) is

What is the nature of Al_(2)O_(3) and B_(2)O_(3) ?

Calculate the percentage composition of: Alumina (Al_(2) O_(3) , potassium oxide (K_(2) O) , and silcia (SiO_(2)) in the sample of clay (Al_(2) O_(3). K_(2) O. 6SiO_(2)) . b. Potassium sulphate (K_(2) SO_(4)) . Aluminium sulphate, and water of crystallisation in the simple of potash alum, (K_(2) SO_(4). Al_(2) (SO_(4))_(3). 24H_(2) O) .

What is the nature of Al_(2)O_(3) ? (Acidic/Basic)

Al_(2)O_(3) reacts with