(Answered) A digital watch battery draws 025 milliamperes of current

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A digital watch battery draws 0.25 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 1.20 g of each of these four substances, for how many hours will the watch continue to run?

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