Question- a watt is a unit of electrical power and is equal, Chemistry

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Question- a watt is a unit of electrical power and is equal

Question- A watt is a unit of electrical power and is equal to 1 joule per second (1 W = 1 J/s). How many hours can a calculator drawing 5*10^-4 watts be operated by a silver oxide battery having a cell potential of 1.34 V if a mass of 1.00 g of Ag2O is available at the cathode?

The cell reaction is: Ag2O(s) + Zn(s) + H2O>>> Zn(OH)2(s) + 2Ag(s)

Please illustrate work if possible thanks

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