Calculate the emf and ΔG
for the cell reaction at 25
o
C:
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0
Zn
2+
+2e
−
→Zn; E
Zn
2+
/Zn
0
=−0.763V
Cd
2+
+2e
−
→Cd; E
Cd
2+
/Cd
0
=−0.403 V
Cell reaction:
Cd
2+
+Zn→Cd+Zn
2+
emf of the cell is, E
cell
0
=0.763−0.403=0.360 V
ΔG
0
=−nFE
cell
0
where, n=2 and F=faraday constant = 96485 C/mol
ΔG
0
=−2×96485×0.36
∴ΔG
0
=69.5 kJ
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