Question

calculate the no. of aluminium ions in 0.05 g of aluminium oxide.

Answer 1

Molecular weight of Al2O3 = 102 g.

102 g of Al2O3 contains 6.022X1023 molecules.

0.051g of Al2O3 contain X number of molecules.

X = 0.051 X 6.022X1023 /102 = 0.003 X 1020

X = 3 X 1020

1 molecule of Al2O3 contains – 2 Al+3ions.