You have 32 million atoms of Uranium - 238. How many atoms will be left after 5 half-lives? (hint you have to divide it in half five times.)

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the answer is learned

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you need to have a picture of the atom that way we can answer it