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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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fnmw fnmw
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3 years ago
An archaeological sample contains 0.700 g of lead-206 and 2.144 g of uranium-238. Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The decay rate constant for the uranium is 1.54 × 10–10/year. What is the age of the sample?


▸ 8.41 × 109 years

▸ 9.03 × 108 years

▸ 2.08 × 109 years

▸ 6.33 × 109 years

▸ None of these are correct.
Textbook 
Chemistry: An Atoms First Approach

Chemistry: An Atoms First Approach


Edition: 3rd
Authors:
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kennettjkennettj
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3 years ago
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#2
2 years ago
thank you
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#3
10 months ago


Half life = 0.693 / k

k = 1.537 x 10-10 year

Half life = 0.693 / 1.537 x 10-10 = 4.509 x 109 Years

Hence answer is option A
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