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Part 1 The half-lives of 235U and 23$U are 7.04 x 10° years and 4.47 x 10° years, respectively, and the present abundance ratio is 23$U/235U = 137.7. It is thought that their abun- dance ratio was 1 at some time before our earth and solar system were formed about 4.5 × 10° years ago. Estimate how long ago the supernova occurred that supposedly produced all the uranium isotopes in equal abundance, including the two longest lived isotopes, 23$U and 235U.

Part 1 The half-lives of 235U and 23$U are 7.04 x 10° years and 4.47 x 10° years, respectively, and the present abundance ratio is 23$U/235U = 137.7. It is thought that their abun- dance ratio was 1 at some time before our earth and solar system were formed about 4.5 × 10° years ago. Estimate how long ago the supernova occurred that supposedly produced all the uranium isotopes in equal abundance, including the two longest lived isotopes, 23$U and 235U.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
Section: Chapter Questions
Problem 30QRT
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Part 1 The half-lives of 235U and 238SU are 7.04 x 10* years and 4.47 x 10° years, respectively, and the present abundance ratio is 238U/235U = 137.7. It is thought that their abun- dance ratio was 1 at some time before our earth and solar system were formed about 4.5 × 10° years ago. Estimate how long ago the supernova occurred that supposedly produced all the uranium isotopes in equal abundance, including the two longest lived isotopes, 238U and 235U. and the accepted age of the Part 2 Using the result of Part 1 earth, 4.5 x 10° yr, calculate the 23$U/235U ratio at the time the earth was formed.
Transcribed Image Text:Part 1 The half-lives of 235U and 238SU are 7.04 x 10* years and 4.47 x 10° years, respectively, and the present abundance ratio is 238U/235U = 137.7. It is thought that their abun- dance ratio was 1 at some time before our earth and solar system were formed about 4.5 × 10° years ago. Estimate how long ago the supernova occurred that supposedly produced all the uranium isotopes in equal abundance, including the two longest lived isotopes, 238U and 235U. and the accepted age of the Part 2 Using the result of Part 1 earth, 4.5 x 10° yr, calculate the 23$U/235U ratio at the time the earth was formed.
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