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It takes 15 kWh (kilowatthours) of electrical energy to produce 1.0 kg of aluminum metal from aluminum oxide by the Hall-Heroult process. Compare...

It takes 15 kWh (kilowatthours) of electrical energy to produce 1.0 kg of aluminum metal from aluminum oxide by the Hall-Heroult process. Compare this to the amount of energy necessary to melt 1.0 kg of aluminum metal. (The enthalpy of fusion for aluminum metal is 10.7 kJ/mol [1 watt = 1 J/s].)
Hall-Heroult process

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