Suppose that a reactor using U- 235 has an output of 700 MW and is 
efficient. An atom of 
undergoes fission in a reactor liberating 200 MeV energy, then, energy generated from the reactor per fission and mass of uranium it consume in 24 h are
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Energy released in each fission of 
Since, only 
of this is utilised efficiently, therefore energy generated from the reactor per fission
As, the output of the reactor is 700 MW, the number of fission required per second
The number of 
atoms consumed in 24 h
There are 
atoms in 235 kg of U-235.
Therefore, the mass of U- 235 consumed during 24 h
Thus, energy generated from the reactor per fission and mass of uranium are 
and 3.7 kg.
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