Question

If the standard electrode potential for the cell $Z n\left|Z n^{2+}(a q) \| C u^{2+}(a q)\right| C u$ is $1.10\, V$ then the maximum work done by this cell will be

• A. −106.15 kJ
• B. −212.30 kJ
• C. −318.45 kJ
• D. −424.60 kJ

Answer 1

Answer: (B)

Maximum work done by the cell $W=-n E^{o} F$
where, $n =$ number of electrons loss or gain $E^{o}$
standard electrode potential of cell. $F=1 F$
or $96500 \,C$
$\therefore W=-2 \times 1.1 \times 96500 $
$\therefore W=-212300\, J\{1000 J=1 \, k J\}$
$\therefore W=-212.3 \, k J$