Asked Dec 5, 2019

A digital watch battery draws 0.20 milliamperes of current, which is provided by a mercury battery whose net reaction is:

HgO(s) + Zn(s) → ZnO(s) + Hg(l)

If a partially used battery contains 1.90 g of each of these four substances, for how many hours will the watch continue to run?


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