Given below are the half-cell reactions:
Mn\(^{2+}\) + 2e\(^-\) \(\rightarrow\) Mn (E\(^\circ\) = -1.18 V)
Mn\(^{3+}\) + e\(^-\) \(\rightarrow\) Mn\(^{2+}\) (E\(^\circ\) = +1.51 V)
The E\(^\circ\)\(_{cell}\) for 3 Mn\(^{2+}\) \(\rightarrow\) Mn + 2Mn\(^{3+}\) will be \rule{2cm{0.1mm}}