Question

Aluminium is extracted from aluminium oxide as shown. Calculate the mass of aluminium that can be formed from 1020g of aluminium oxide.

2Al₂O₃ ---> 4Al +3O₂

Answer 1

Answer:

540g  

Explanation:

Without Equation Use :

If we are Having Al₂O₃ whose relative molecular mass will be

                                                  = 2 (27) + 3(16)

                                                 = 54 + 48 = 102g

                       In 102 g of Al₂O₃ Aluminium mass is  =54g

                       In 1 g of Al₂O₃ Aluminium mass is       = 54/102 g

               And In  1020g of Al₂O₃ we will have mass = 54/102 * 1020

                                                                                      =540g      

With use of  Equation :

                                2Al₂O₃ ---> 4Al +3O₂

         2 molecules of Al₂O₃ Gives 4 molecules of Al

 means,   2(102)g of Al₂O₃ gives 4(27)g of Al

                       i.e.,

                          In 204g of Al₂O₃ Aluminium mass is  =108g

                          In 1 g of Al₂O₃ Aluminium mass is       = 108/204g

                  And In  1020g of Al₂O₃ we will have mass = 108/204 * 1020

                                                                                         = 540g

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