ElectrochemistryHard
Question
The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows :
Al2O3 → 
Al + O2, ᐃrG = + 966 kJ mol-1
The potential difference needed for electrolytic reduction of Al2O3 at 500oC is at least
Al2O3 → Al + O2, ᐃrG = + 966 kJ mol-1The potential difference needed for electrolytic reduction of Al2O3 at 500oC is at least
Options
A.4.5 V
B.3.0 V
C.2.5 V
D.5.0 V
Solution
ᐃG = - nFE ⇒ E = 
= - 2.5 V
∴ The potential difference needed for the reduction = 2.5 V
= - 2.5 V
∴ The potential difference needed for the reduction = 2.5 V
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