Calculations involving masses

Aluminium oxide has the chemical formula $Al2O3\text{Al}_2\text{O}_3$ .

Calculate the mass of aluminium in 285 g of aluminium oxide. Give your answer to three significant figures.

(Relative atomic masses: $O=16.0\text{O} = 16.0$ , $Al=27.0\text{Al} = 27.0$ ; Relative formula mass: $Al2O3=102.0\text{Al}_2\text{O}_3 = 102.0$ )

You must show your working.

[3]

Aluminium oxide has the chemical formula $Al2O3\text{Al}_2\text{O}_3$ .

Calculate the mass of aluminium in 285 g of aluminium oxide. Give your answer to three significant figures.

(Relative atomic masses: $O=16.0\text{O} = 16.0$ , $Al=27.0\text{Al} = 27.0$ ; Relative formula mass: $Al2O3=102.0\text{Al}_2\text{O}_3 = 102.0$ )

You must show your working.

[3]

Calculations involving masses Questions