Chemistry, 28.12.2019 05:31, aliopqwas

The half-life of uranium-235 is 700 million years. if a rock that formed in the early precambrian era (about 2100 million years ago) originally contained 20 grams of uranium-235, about how much uranium-235 would be left in that rock today?

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The half-life of uranium-235 is 700 million years. if a rock that formed in the early precambrian er...