Question

calculate the number of aluminium cone 0.051g of aluminium oxide​

Answer 1

Explanation:

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.