Question

$E^{\circ}$ cell of a galvanic cell is $1.1\, V$. Standard free energy change can be given as

• A. $-212.27 \,kJ\, mol ^{-1}$
• B. $-212.27 \,J\, mol ^{-1}$
• C. $+212.27 \,kJ\, mol ^{-1}$
• D. $+212.27 \,V$

Answer 1

Answer: (A)

For a glavanic cell $Z n+C u^{2+} \rightarrow C u+Z n^{2+}$
$\Delta G^{\circ}=-n F \,E^{\circ}$
$n=2, E^{\circ}=1.1 \,V$
$F=96500 \,C\,mol ^{-1}$
$\Delta G^{\circ}=-2 \times 96500 \times 1.1$
$=-212300\, J\,mol ^{-1}$
$=-212.3 \,J\,mol ^{-1}$