Question

On passing electric current through molten aluminium oxide it decomposes to form aluminium metal and oxygen gas

Answer 1

Answer:

Explanation:

2Al2O3(l)  =  4Al + 3O2

Answer 2

$2Al_2O_3(l)\rightarrow 4Al(s)+3O_2(g)$

Explanation:

Decomposition reactions require breaking of bonds which require energy and thus all of the decomposition reactions are endothermic reactions. They require energy in the form of heat, electricity or sunlight and thus called as thermal, electrolytic and photolytic decomposition respectively.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Thus the balanced chemical equation for decomposition of aluminium oxide is:

$2Al_2O_3(l)\rightarrow 4Al(s)+3O_2(g)$

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