Calculate the standard free energy change (kJ) for the following reaction using the standard electrode potentials.
Sn(s) + Ni2+(aq) ⇌ Sn2+(aq) + Ni(s)
Ni 2+(aq) + 2 e - → Ni(s) E° = -0.25 V
Sn2+(aq) + 2 e - → Sn(s) E° = -0.14 V
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