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Challenge problem:Critical mass is the smallest amount of radioactive material necessary to sustain a nuclear chain...

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Chemistry

Challenge problem:Critical mass is the smallest amount ofradioactive material necessary to sustain a nuclear chain reaction.Uranium-235, the isotope of uranium used in the \"little boy\" bombdropped on Hiroshima during Wordl War II,has a critical mass of 52kg. How many long tons of yellowcake (64% uranium by mass) need tobe processed to produce a critical mass of U-235? The percentnatural abundance of U-235 is 0.72% and its nuclide mass is235.0439 amu.

1 long ton = 2240 lb., 1 kg = 2.20 lb.

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3.8 Ratings (592 Votes)
Let the mass of yellowcake required to produce 52kg criticalmass of U235 be x kgThe mass of Uranium in the above mass of yellowcake 64 of xkg 064x kgNow the number of atoms of U235 needs to be found inthe above mass using the    See Answer
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