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

Explanation

At Anode half cell : `5Fe^(2+)_(aq) to 5Fe_((aq))^(3+) + 5e^(Theta)`
At cathode half cell : `MnO_(4(aq))^(-) + 8H_((aq))^(+) + 5e^(Theta) to Mn_((aq))^(2+) + 4H_2O_((l))`
Overall redox reaction : `5Fe_((aq))^(2+) + MnO_(4(aq))^(-) + 8H_((aq))^(-) to 5Fe_((aq))^(3+) + Mn_((aq))^(2+) + 4H_2O_(l)`.