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Estimate the minimum potential difference needed to reduce Al2O3 at 5000C. The free energy change for the decomposition reaction is:

2/3 Al2O3----------------->4/3Al +O2


7 years ago


Answers : (1)


Hi Belani,

2/3 Al2O3----------------->4/3Al +O2

ΔG= +960 kJ for 2/3moles

But ΔG=-nFE

E = ΔG/(-nF)

F = 96500 C mol-1

E = 960×1000/(- 2/3 × 96500) = -14.9 V

This implies that the minimum potential difference needed is 14.9 V chandra sekhar

7 years ago

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