A current is passed through a solution of a Zn salt so that 28950 C of charge flows (F = 96 500 C/mol). What mass of Zn is deposited at the cathode? (Zn = 65)

Answer and explanation

Correct answer: D. 9.75 g

  1. Step 1: Moles of electrons mol.
  2. Step 2: Zn needs 2 mol of electrons per mole of metal, so mass g.
Answer
9.75 g.
Why not the others: 19.5 g: the charge on the ion is ignored. 39 g: the charge number is multiplied instead of divided. 6.5 g: the wrong charge number is used.

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