Derive expression to calculate emf (reduction) of the following half cells at `25^@C`
`Cl_2 (g)|2Cl^(-) (Pt) (1 atm)`

Explanation

To derive the expression for the electromotive force (emf) of the half-cell reaction given by \( \text{Cl}_2(g) | 2\text{Cl}^-(aq) \) at \( 25^\circ C \), we will follow these steps:

### Step 1: Write the half-cell reaction
The half-cell reaction for the reduction of chlorine gas to chloride ions is:
\[ \text{Cl}_2(g) + 2e^- \rightarrow 2\text{Cl}^-(aq) \]

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