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Suppose that the electric average power consumption, day and night, in a typical house is 840...

Suppose that the electric average power consumption, day and night, in a typical house is 840 W. What is the initial mass of ^235_92U would have to undergo fission to supply the electrical needs of such a house for a year? (assume 200 MeV is released per fission, as well as 100% efficiency). Include units please.

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