A current is passed through a solution of a Al salt so that 19300 C of charge flows (F = 96 500 C/mol). What mass of Al is deposited at the cathode? (Al = 27)

Answer and explanation

Correct answer: A. 1.8 g

  1. Step 1: Moles of electrons mol.
  2. Step 2: Al needs 3 mol of electrons per mole of metal, so mass g.
Answer
1.8 g.
Why not the others: 5.4 g: the charge on the ion is ignored. 16.2 g: the charge number is multiplied instead of divided. 1.35 g: the wrong charge number is used.

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