What charge is needed to deposit 0.25 mol of copper from a Cu²⁺ solution? (F = 96 500 C/mol)
Answer and explanation
Correct answer: A. 48250 C
- Step 1: Cu²⁺ + 2e⁻ → Cu: two moles of electrons are needed for each mole of copper.
- Step 2: Q = n x 2 x F = 0.25 x 2 x 96 500 = 48250 C.
Answer
48250 C.
Why not the others: 24125 C: the 2 electrons per copper ion were left out. 96500 C: the charge was counted twice. 386000 C: the charge per mole was divided by the moles.
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