The Gibb's energy for the decomposition of at 500°C is as follows :
The potential difference (in V) needed for electrolytic reduction of at 500°C is at least
5
4.5
3
2.5
In the given balanced reaction,
The total number of moles of electrons transferred from the Oxide ion to aluminium ions
is 4
Now, the change in Gibb's Free energy is given as
for the given case
Putting values in the equation, we have