What will be the spontaneous reaction when the following half reactions are combined ?
(i) `Fe^(3+) + e^(-) to Fe^(2+)` , (ii) `MnO_(4)^(-) + 8 H^(+) + 5 e^(-) to Mn^(2+) + 4 H_(2) O , (E^(Theta) = + 1.49 V`)
What is the value of `E_(cell)^(Theta)` ?

Explanation

To determine the spontaneous reaction when the given half-reactions are combined, we will follow these steps:

### Step 1: Identify the half-reactions and their standard reduction potentials
- The first half-reaction is:
\[ \text{Fe}^{3+} + e^- \rightarrow \text{Fe}^{2+} \quad (E^\circ = +0.77 \, \text{V}) \]
- The second half-reaction is:
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