Question
For the reaction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25o C. The value of standard Gibbs energy, ΔGo will be (F = 96500 C mol-1 )
-
-89.0 kJ
-
-89.0 J
-
-44.5 kJ
-
-98.0 kJ
Solution
A.
-89.0 kJ
We know that,
standard Gibbs energy, ΔGo = -nFEocell
For the cell reaction,
2 Ag+ + Cu → Cu2+ + 2 Ag
ΔEocell =+ 0.46 V
ΔGo = =- 2 x 96500 x 0.46
= -88780 J
=-88.7 kJ = -89.0 kJ
ΔEocell =+ 0.46 V
ΔGo = =- 2 x 96500 x 0.46
= -88780 J
=-88.7 kJ = -89.0 kJ
