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Question: aluminum oxide is to be electrolyzed to metallic aluminum...

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Aluminum oxide (Al2O3) is to be electrolyzed to metallic aluminum in an electrochemical cell. The electrodes of the cell are made of graphite. The products of the reaction are metallic aluminum and carbon dioxide. Metallic aluminum does not react with graphite.

a) Write the chemical reaction that takes place in the cell.

b) Calculate the minimum voltage at which the electrolysis may be carried out at 1250K.

DATA:

2Al +\frac{3}{2}O_{2}=Al_{2}O_{3} ; \Delta G^{\circ} = -1,676,000 + 320T

C + O_{2}=CO_{2} ; \Delta G^{\circ} = -394,100 - 0.84T

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