A digital watch draws 0.20 mA of current provided by a mercury battery, whose net reaction is:
HgO(s) + Zn(s) ZnO(s) + Hg(l)
If a partially used battery contains 1.44 g of each of these four substances, for how many more hours will the watch run? The Faraday constant is 96485 C/mol. (in hours)