1.) The cell reactions occurring in abattery are given by:
Cathode : 2MnO2 (s) + H2O (l) + 2e-→ Mn2O3 (s) + 2HO-(aq) E 0 red = +0.15 V
Anode : Zn (s) + 2HO- (aq) → Zn(OH)2 (s) + 2e- E 0 red =-1.25 V
a) What is the overall cell potential?What is the free energy change for this process?
b) During the discharge of the battery, 2.00 g of Mn2O3is produced at the cathode. How many grams of Zn wereconsumed?
c) Consider this half reaction: Cd(OH)2 + 2e- → Cd(s) +2HO- (aq) E°red = -0.76V What is the overall cell potential andfree energy change of the battery described above if the Zn anodeis replaced by Cd?
2.) Ca(s) can be obtained by electrolysis of moltenCaCl2. What amperage is needed to produce 10.00 g of Ca(s) in aperiod of 1h assuming that the process is 100%efficient?
