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College Chemistry

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Calculate the cell potential for the following Galvanic cell:

Co(s) Co2+ (0.15 mol L-1, ag)Fe 2+ (0.68 mol L-1, ag)Fe(s)

Given that the standard reduction potential Eo for Co2+ is -0.28 V and Eo for Fe2+ is -0.44 V.

Anwer is -0.14 V

The left side of the above equaton is the annode and the right the cathode therefore -0.44 - -0.28 = -0.16 which is incorrect. What steps are taken showing maths and answer of -0.14. Are charges included?
maths to get -0.14 V.

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