Compute standard e.m.f. of cell
`Zn_((s))+CO^(2+)rarr CO_((s))+Zn^(2+)`
Given `E_(Zn//Zn^(2+))^(@)=+0.76V` and
`E_(CO //CO^(2+))^(@)=+0.28V`

Explanation

To compute the standard electromotive force (e.m.f.) of the cell reaction given by:

\[ \text{Zn}_{(s)} + \text{CO}^{2+} \rightarrow \text{CO}_{(s)} + \text{Zn}^{2+} \]

we need to follow these steps:

### Step 1: Identify the half-reactions
The overall cell reaction can be broken down into two half-reactions:
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