Calculate the maximum work that can be obtained from the cell Zn|Zn2+(1M)||Ag+(1M)|Ag where, E°Zn=-0.76 V and E°Ag=0.8 V

Question

Calculate the maximum work that can be obtained from the cell Zn|Zn2+(1M)||Ag+(1M)|Ag where, E°Zn=-0.76 V and E°Ag=0.8 V  (A) 301.080 kJ (B) 201.830 kJ (C) 112.830 kJ (D) 213.630 kJ

Tardigrade Admin · Accepted Answer

Electrical work done = Δr G° = -n FE° E° = E° textcathode - E° textanode = 0.80 - (-0.76) = 1.56 V Δ G° = -2 × 96500 × 1.56 = -301080 Jmol-1 = -301.080 kJ mol-1

Q. Calculate the maximum work that can be obtained from the cell
$Z n ∣ ∣ Z n^{2 +} (1 M) ∣ ∣ ∣ A g^{+} (1 M) ∣ A g$
where, $E_{Z n}^{\circ} = - 0.76 V$ and $E_{A g}^{\circ} = 0.8 V$

301.080 kJ

201.830 kJ

112.830 kJ

213.630 kJ

Electrical work done
$= Δ_{r} G^{\circ} = - n F E^{\circ}$
$E^{\circ} = E_{cathode}^{\circ} - E_{anode}^{\circ}$
$= 0.80 - (- 0.76)$
$= 1.56 V$
$Δ G^{\circ} = - 2 \times 96500 \times 1.56$
$= - 301080 J m o l^{- 1}$
$= - 301.080 k J m o l^{- 1}$

Q. Calculate the maximum work that can be obtained from the cell Zn∣∣​Zn2+(1M)∣∣​∣Ag+(1M)∣Ag where, EZn∘​=−0.76V and EAg∘​=0.8V