How many atoms you need to break to make an atomic bomb?
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Little boy had 64 kg of uranium. At most 5% of that fissioned so some 3kg. Atomic weight of weapons grade uranium is 235, so 235 gram per mole. That means 3/0.235 moles or about 13 moles fissioned. 1 mole is 6×10^23 atoms so about 8×10^24 atoms for that one. Yes that is an 8 with 24 zeroes behind it.
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