A current is passed through a solution of a Cu salt so that 9650 C of charge flows (F = 96 500 C/mol). What mass of Cu is deposited at the cathode? (Cu = 64)

Answer and explanation

Correct answer: D. 3.2 g

  1. Step 1: Moles of electrons mol.
  2. Step 2: Cu needs 2 mol of electrons per mole of metal, so mass g.
Answer
3.2 g.
Why not the others: 6.4 g: the charge on the ion is ignored. 12.8 g: the charge number is multiplied instead of divided. 2.133 g: the wrong charge number is used.

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