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A nuclear physicist finds 2.9 μg of 236U in a piece of uranium ore, which has...

A nuclear physicist finds 2.9 μg of 236U in a piece of uranium ore, which has a half-life of 2.1×107 y. Calculate the amount of mass of 236U that would had to have been on Earth 6.4×108 y ago for 2.9 μg to be left today.

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