Aluminum metal can be recycled from scrap metal by melting

Last updated: 8/5/2022

Aluminum metal can be recycled from scrap metal by melting the metal to evaporate impurities. (a) Calculate the amount of heat needed to purify 1.00 mole of Al originally at 298 K by melting it. The melting point of Al is 933 K. The molar heat capacity of Al is 24 J/(mol-K), and the heat of fusion of Al is 10.7 kJ/mol. (b) The equation for the overall process of extracting Al from Al-O, is shown below. Which requires less energy, recycling existing Al or extracting Al from Al-O,? Justify your answer with a calculation. Al₂0,(s) → 2 Al(s) + 0₂ (8) AH = 1675 kJ/mol,