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Al 2O3 is reduced by electrolysisat low potentials and high currents. If  4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol–1) [2009]
  • a)
    8.1 × 104 g
  • b)
    2.4 × 105 g
  • c)
    1.3 × 104 g
  • d)
    9.0 × 103 g
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Al 2O3 is reduced by electrolysisat low potentials and high currents. ...
Now since 96500 C liberates 9 g of Al
8.64 × 108  C liberates 
   = 8.1 × 104 g of Al
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Most Upvoted Answer
Al 2O3 is reduced by electrolysisat low potentials and high currents. ...
The balanced chemical equation for the reduction of Al2O3 by electrolysis is:

2 Al2O3 + 3 C → 4 Al + 3 CO2

From the balanced equation, we can see that for every 2 moles of Al2O3, we need 3 moles of C to produce 4 moles of Al. Therefore, the amount of carbon required to produce 4.0 g of Al is:

3 mol C : 4 mol Al = x g C : 4.0 g Al

x = (4.0 g Al) x (3 mol C/4 mol Al) x (12.01 g C/mol C) = 9.02 g C

So, we need 9.02 g of carbon to produce 4.0 g of aluminum.
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Al 2O3 is reduced by electrolysisat low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol–1) [2009]a)8.1 × 104 gb)2.4 × 105 gc)1.3 × 104 gd)9.0 × 103 gCorrect answer is option 'A'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Al 2O3 is reduced by electrolysisat low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol–1) [2009]a)8.1 × 104 gb)2.4 × 105 gc)1.3 × 104 gd)9.0 × 103 gCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Al 2O3 is reduced by electrolysisat low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of Al = 27 g mol–1) [2009]a)8.1 × 104 gb)2.4 × 105 gc)1.3 × 104 gd)9.0 × 103 gCorrect answer is option 'A'. Can you explain this answer?.
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