The standard emf for the cell using the overall cell reaction below is +2.20 v:
2al(s) + 3i2(s) → 2al3+(aq) + 6i-(aq)
the emf generated by the cell when [al3+] = 4.5 × 10-3 m and [i-] = 0.15 m is v.
(a) 2.23
(b) 2.20
(c) 2.39
(d) 2.32
(e) 2.10

emf generated by cell is 2.32 V

Explanation:

Oxidation:

Reduction:

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Overall:

Nernst equation for this cell reaction at -

where n is number of electrons exchanged during cell reaction, is standard cell emf , is cell emf , is concentration of and is concentration of

Plug in all the given values in the above equation -

So,

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

it means there are 3 atoms of oxygen