Use tabulated data to calculate the standard cell potential, E° following redox reactions occurring in an electrochemical cell at 25°C. ALSO state whether or not the reaction is spontaneous as written. (The redox equations are alreadybalanced.) for the 3. a) Fe(s) Mn2(aq) Fe2 (aq)+ Mn(s) b) Mno (aq)4H (aq)Fe(s) MnO2(s) 2 H20(U) Fe (aq)