consider a galvanic cell that uses the half reactions
2H+ +e ----->H2 
Mg2+ + e ----> Mg
write the balanced equation for the cell reaction . calculate E0 cell , Ecell and delta G0 if concentrartion are 1meach and PH2 =  atm .

Dear Student,

At cathode :2H+ + 2e-  H2At anode :Mg2+ + 2e-  MgThe balanced cell reaction is  :Mg + 2H+  Mg2+ + H2E°cell= E°cathode-E°anode         =E°H+/H2 - E°Mg2+/Mgand,E°H+/H2=0So, E°cell= - E°Mg2+/Mgand, Ecell=E°cell-0.059nlog[Mg2+][H+]2Here, n=2and, G°=-nFE°cellSince the concentration of [Mg2+] and [H+] is not given, also E°Mg2+/Mg is not given, so the value of E°cell, Ecell and G° cannot be calculated. 

  • 0
What are you looking for?