# Q 11.     Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.

Give, the mass of Aluminum Oxide = 0.051 g.

The molecular mass of Aluminium Oxide = 2 x mass of Aluminium + 3 x mass of Oxygen.

= 2 x 27 + 3 x 16

= 102 g

Number of Moles of Aluminium Oxide :

Now, Since 1 mole of Aluminium Oxide contain 2 moles of Aluminium ion,

The Number of Moles of Aluminium ion = 2 x number of moles of Aluminium Oxide

=  2 x 0.0005

= 0.001 moles.

Now, As the number of ion in 1 mole =   ions.

The number of ions in 0.001 moles of Aluminium ion =  ions

=  ions.

Hence there are  Aluminium ions in 0.051 g of aluminium oxide.

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