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Given the standard reduction potentials E°(Fe3+/Fe2+) = +0.77 V and E°(Sn2+/Sn) = -0.14 V, what is the standard cell potential for the reaction Sn(s) + 2Fe3+(aq) → 2Fe2+(aq) + Sn2+(aq)?

1. 0.91 V
2. 1.40 V
3. 1.68 V
4. 0.63 V

Correct answer: 0.91 V

Solution

The standard cell potential is calculated by subtracting the reduction potential of the anode from that of the cathode. Here, iron is reduced (E° = +0.77 V) and tin is oxidized (E° = -0.14 V), leading to a cell potential of 0.77 V - (-0.14 V) = 0.91 V.

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