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Grade: 12
        

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
























?G=+960kJ

10 years ago

Answers : (1)

askiitian.expert- chandra sekhar
10 Points
							

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

 

askiitian.expert- chandra sekhar

10 years ago
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