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maportil maportil
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2 weeks ago

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U →206Pb is 4.51 × 109 yr.)



▸ 1.32 atoms

5.8 × 10–6 atoms



2.4 × 1018 atoms



3.3 × 1018 atoms



3.5 × 1021 atoms

Textbook 
Chemistry: Atoms First

Chemistry: Atoms First


Edition: 4th
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letssdoothissletssdoothiss
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maportil Author
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2 weeks ago
this is exactly what I needed
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Helped a lot
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Smart ... Thanks!
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