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16-03-2018
Chemistry

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These equations below show two standard reduction potentials.

Which value represents the standard cell potential of the spontaneous overall reaction?

These equations below show two standard reduction potentials Which value represents the standard cell potential of the spontaneous overall reaction class=

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16-03-2018

We have
   Mn2+ + 2e- → Mn    (reduction)
   Fe2+ → Fe3+ + e-   (oxidation)

Since reduction occurs at the cathode, the cathode is Mn(s).
The overall cell potential is
   Ecell = Ered,cathode - Ered,anode
           = -1.18 - 0.77
           = -1.95V

The reaction is spontaneous since Ecell is negative.

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