Solve this: The standard emf of the following cell: Cd(s)|CdCl2(aq) (0 10 M)||Cl-| AgCl(s)|Ag(s) In which the cell reaction is - Chemistry -

Question

Solve this:
The standard emf of the following cell:
Cd(s)|CdCl2(aq) (0 10 M)||Cl-|
AgCl(s)|Ag(s)
In which the cell reaction is 2AgCl(s) + Cd(s) → 2Ag(s)
+Cd2+ + 2Cl-(aq) is 0 6915 V at
100 C and 0 6753 V at 250C The ∆ H of
reaction at 250C is
(A) -192 5 kJ (B) -234 7 kJ
(C) 123 5 kJ (D) -167 26 kJ

Shyama Charan Mandal · Accepted Answer

Dear
Student,

1 The formula used is Gibbs Helmoltz equation :

∆G=∆H-T∆S2
 From the data in question: ∆G1(283K) =-nFE∘=-2×96500×0
6195=11
96 kJ ∆G2(298K) = -nFE∘=-2×96500×0
6753=13 03 kJ3
 Using equation 1 :    11
96 kJ =    ∆H-283∆S            
(1)- 13
03 kJ =-∆H+298∆S          
(2)we get,  ∆S =-572 JK-1   ∆H= 123
5 kJ         
Regards,