The measured e.m.f. at `25^(@)C` for the cell reaction ,
`Zn(S)+Cu^(2+)(1.0 M)to Cu(s) +Zn^(2+) (0.1 M)` is 1.3 volt, Calculate `E^(@)` for the cell reaction.

Explanation

To calculate the standard electromotive force (E°) for the cell reaction given the measured e.m.f. (E_cell) at 25°C, we will use the Nernst equation. Here are the steps to solve the problem:

### Step 1: Write the Nernst Equation
The Nernst equation at standard temperature (25°C) is given by:
\[ E_{cell} = E^\circ_{cell} - \frac{0.0591}{n} \log Q \]

### Step 2: Identify the Components of the Reaction
The given cell reaction is:
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