The chemical reaction for a zinc-oxygen cell is:
Zn (c) + 1/2O2(g) + H2O (l) = Zn(OH)2 (c)
and the thermodynamic properties at 25 oC yield:
DHo = -357.42 kJ/mol; DGo = -317.94 kJ/mol
a) Calculate the reversible emf of the cell and its temperature coefficient;
b) Determine the amount of heat to be supplied or removed from the cell to maintain a constant temperature of 25 oC under reversible conditions;
c) Calculate the cooling rate necessary to maintain a constant temperature of 25 oC when the cell delivers a current of 1 ampere under 1 volt.