How many faradays of charge are required to produce of aluminium from molten ? (Atomic mass of )
Answer and explanation
Correct answer: A.
- Step 1: Calculate the moles of aluminium: .
- Step 2: The reduction of aluminium ion is: .
- 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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