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A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in ...

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A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in ...

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

Edition: 4^th

Author: Burdge

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