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A neutron hits U 235 which then splits into a Cs 140 atom (139.91728u), a Rb...

A neutron hits U 235 which then splits into a Cs 140 atom (139.91728u), a Rb 93 atom (92.92204u), and several neutrons. How many grams of U 235 do we need to start with to produce 1.3 x 10^9 J?

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