Write the overall rendox reaction which takes place in the galvanic cell, `Pt(s)abs(Fe^(2+)(aq), Fe^(3+)(aq))abs(MnO_(4)^(-)(aq), H^(+)(aq),Mn^(2+)(aq))Pt(s)`

Explanation

Oxidation at anode
`Fe^(2+) rarr Fe^(3+)+e^(-) " ...(1)"`
Reduction at cathode
`MnO_(4)^(-)+8H^(+)+5e^(-) rarr Mn^(2+)+4H_(2)O" ...(2)"`
To balance multiply equation `(1) times 5` and equation `(2) times 1`
`5Fe^(2+)+MnO_(4)^(-)+8H^(+) rarr Mn^(2+)4H_(2)O+5Fe^(3+)`
Overall Redox reaction is
`5Fe^(2+)""_((aq))+MnO_(4(aq))^(-)+8H_((aq))^(+) rarr 5Fe^(3+)""_((aq))+Mn^(2+)""_((aq))+4H_(2)O(l)`