Using the following standard reduction potentials, Fe3+(aq) + e- Fe2+(aq) E° = +

Question

Using the following standard reduction potentials, Fe3+(aq) + e- Fe2+(aq) E° = +0.77V

Ni2+(aq) + 2 e- Ni(s) E° = -0.23 V

Calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions.

2 Fe3+(aq) + Ni(s) Ni2+(aq) + 2 Fe2+(aq)

What mass of iron can be plated onto an object in 33.5 minutes at 8.70 A of current if

Fe3 (aq) + 3e Fe(s)

Please be as specific as possible with the explanations along with the workout of the question, i really do not understand this question. Thank you ahead of time.

Explanation / Answer

Reduction : Gain of electrons: 2Fe3+ + 2e- ===> 2Fe2+ Eo= 0.77V

Oxidation = loss of electrons : Ni ===> Ni2+ + 2e-   Eo = 0.23V

So, Eocell = Ered + Eox = 0.77 + 0.23 = 1.00V

As the sign of Eocell is positive, the cell is spontaneous.

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