How many faradays of charge are required to produce of aluminium from molten ? (Atomic mass of )

Answer and explanation

Correct answer: A.

  1. Step 1: Calculate the moles of aluminium: .
  2. Step 2: The reduction of aluminium ion is: .
  3. Step 3: The deposition of of requires of electrons, which equals of charge.
Answer
.
Why not the others: deposits only () of aluminium; corresponds to divalent cations (such as ); produces () of aluminium.

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