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Calculate the standard cell potential (in V) of the cell in which following reaction takes place - Fe2+ (aq) + Ag (aq) → Fe3+ (aq) + Ag(s) Given that E°Ag+/Ag = x V E°Fe3+/Fe = y V E°Fe2+/Fe = z V

1. x + 2y - 3z
2. x + y - z
3. x - y
4. x - z

Correct answer: x + y - z

Solution

The standard cell potential is calculated by taking the reduction potential of the cathode (Ag+/Ag) and subtracting the reduction potential of the anode (Fe2+/Fe). In this case, the overall reaction involves the conversion of Fe2+ to Fe3+, which requires adding the potential of Fe3+/Fe (y) to the potential of Ag (x) while subtracting the potential of Fe2+/Fe (z), leading to the correct expression of x + y - z.

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