Write the Net Ionic Equation and determine the standard pote

Write the Net Ionic Equation and determine the standard potential for the reaction between permanganate and tin(II). From the potential, calculate the free energy of the reaction.

Solution

permanganate and tin(II).---------> Sn(MnO4)2

Permanganate is a strong oxidixer, so Sn+2 will probably be oxidized to Sn+4 and Mn+7 to Mn+2 in acidic solution:
Sn+2 + MnO4- + H+ --> Sn+4 + Mn+2 + H2O

The net equation is
MnO4- + Sn2+ = Mn2+ + Sn4+

MnO4- + 8 H+ + 5e- = Mn2+ + 4 H2O
Sn2+ = Sn4+ + 2e-

2 MnO4- + 16 H+ + 5 Sn2+ = 2 Mn2+ + 5 Sn4+ + 8 H2O