Mixedemotions7706 Mixedemotions7706
  • 09-01-2024
  • Chemistry
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A rock sample contains 1.00 mg of ²⁰⁶Pb and 4.00 mg of ²³⁸U, whose half-ife is 4.47 x 10⁹ years. How long ago was the rock formed? (Hint: make sure to use the mass of the specific isotopes and not the average mass of the element reported on the periodic table!)

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