Question

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is : (Atomic mass Al = 27)A)180 kgB)270 kgC)540 kgD)90 kg Also explain.

Answer 1

3C+ 2Al2O3-------4Al+ 3Co2

=3×12×270/4×27

=90 kg

Answer 2

Answer:

Explanation:

Reaction of carbon with Al2O3 forming Aluminium and carbon dioxide is given :

2Al2O3 + 3C →4Al + 3CO2

​Molar mass of Al = 27 g mol-1​

​Molar mass of Al2O3 = 118 g mol-1

​Molar mass of Carbon = 12 g mol-1

Thus, we can see that according to this reaction, (4×27) = 108 g of Al is formed from the reduction of Al2O3 by (3×12) = 36 g of carbon.

108 g of Al produced by 36 g of Carbon

27000 g of Al is formed by (36 / 108) ×27000

= 90000 g or 90 kg