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Cu^(+) + e^(-) rightarrow Cu, E^(@) = x1...

`Cu^(+) + e^(-) rightarrow Cu`, `E^(@) = x1volt`,
`Cu^(2+) + 2e^(-) rightarrow Cu`, `E^(@) = x_(2)` volt, then for
`Cu^(2+) + e^(-) rightarrow Cu^(+), E^(@)` (volt) will be :

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