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Question

Efficiency of the following cell is 84 %.
A(s)+B2+(aq.)A2+(aq.)+B(s);ΔHo = -285kJ. Then the standard EMF of the cell will be:
  1. 2.2 V
  2. 2.40 V
  3. 0.9 V
  4. 1.24 v

A
2.2 V
B
2.40 V
C
0.9 V
D
1.24 v
Solution
Verified by Toppr

A+B+2A+2+B n=2
Δ4=ΔTΔS
Δs=0
Δ4=ΔH=2 gs kg
Δ4=nFEocell
Eocell=Δ4nF=285×100096500×2
Ecell=1.4767
Ecell=1.4767×84100=1.24 V

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