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NEET2005ChemistrySome Basic Concepts of ChemistryActual

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 ~kg of a aluminium metal from bauxite by the Hall process is: (Atomic mass : A1 = 27)

Options

  1. A270 ~kg
  2. B540 ~kg
  3. C90 ~kg
  4. D180 ~kg

Correct answer

C. 90 ~kg

Step-by-step solution

3 C +2 Al ₂ O ₃ 4 Al +3 CO ₂ (from bauxite) 4 moles of Al is produced by 3 moles of C 1 mole of Al is produced by 3 4 mole of C 10^4 moles of Al is produced by 3 4 10^4 moles of C Amount of carbon used aligned & = 3 4 10^4 12 ~g & =90000 ~g =90 ~kg aligned

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