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 0.50 g of each of these four substances, for how many hours will the watch continue to run?
We need at least 10 more requests to produce the answer.
0 / 10 have requested this problem solution
The more requests, the faster the answer.
A digital watch battery draws 0.25 milliamperes of current, which is provided by a mercury battery...
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 0.50 g of each of these four substances, for how many hours will the watch continue to run?
Mercury cells as “button” batteries are very common and consist of HgO, ZnO, and Zn(OH)2 in a KOH paste. Useful half-cell reactions: HgO(s) + H2O(l) + 2e = Hg(l) + 2OH-(aq) eo = 0.0977 V Zn(OH)42-(aq) + 2e = Zn(s) + 4OH-(aq) eo = -1.285 V Zn(OH)42-(aq) = ZnO(s) + H2O(l) + 2OH-(aq) A)Such batteries have a + sign marked on them. Which half-reaction is occurring at the electrode so marked? B)Draw a schematic of a mercury...
A watt is a unit of electrical power and is equal to one joule per second (1 watt = 1 J s-1). How many hours can a calculator drawing 2.0 × 10-3 watt can be operated by a mercury battery having a cell potential equal to 1.34 V with a mass of 0.22 g of HgO available at the cathode? The cell reaction is HgO(s) + Zn(s) → ZnO(s) + Hg(l)