a) Draw labelled diagram of Standard Hydrogen Electrode ( SHE ).
Write its half cell reaction of $E^{o}$ value.
b) Calculate $△ r G^{⊝}$ for the following reaction :
$F e_{(a q)}^{+ 2} + A g_{(a q)}^{+} \to {F e}_{(a q)}^{+ 3} + A g_{(s)}$ .
(Given : $E_{C e l l}^{0} = + 0.03 V, F = 96500 C$ ).

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Solution

a) The labelled diagram of Standard Hydrogen Electrode ( SHE ) is as shown.
Half cell reaction for SHE
$2 H^{+} (a q) + 2 e^{-} \to H_{2} (g) ↑$
b)
$△ r G^{⊝} = - n F E_{C e l l}^{0} = - 1 \times 96500 \times 0.03 V = - 2895 J / m o l = 2.9 k J / m o l$

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