Over Thanksgiving break, South Bend is struck by a snow stormand loses power. On

Question

Over Thanksgiving break, South Bend is struck by a snow stormand loses power. On the third day, Tanesia decides she is tired of not gaving her phone. Being a good chemistry student, she finds herself some Uranium 235, a fuel that can be used in reactors to produce electricity. Assuming she starts with 10 pounds of water at room temperature and the water boils at normal boiling point, and assuming she usesa turbine that extracts the energy from the system at 70% effciency, how many grams of Uranium 235 would need to undergo fission to fully charge her cell phone?

Explanation / Answer

The electricity required to charge her cell phone is approximately 0.01 KWH

If efficiency is 70% we get 30 MWd per kg of uranium

= 720 MWH per kg of uranium

so uranium required is = 0.01 KWH/ 720 MWH = 1.4 x 10-8 kgs of uranium are required to charge your cell phone

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