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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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cc84sc cc84sc
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5 months ago

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour?



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9.0 × 1016 atoms



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4.3 × 10–4 atoms



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2.2 × 1018 atoms



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2.5 × 1014 atoms



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1.7 × 1014 atoms

Textbook 
Chemistry: Atoms First

Chemistry: Atoms First


Edition: 4th
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jasmjasm
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