if 8.000 grams of U-234 are sealed in a container and then opened many years later -- how much time has passed if the amout of uranium isotope left in the container is 2.833 grams given that the half-life of this isotope of uranium is t1/2 = 200,000 years.

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter25: Nuclear Chemistry
Section25.5: Artifical Nuclear Reactions
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if 8.000 grams of U-234 are sealed in a container and then opened many years later -- how much time has passed if the amout of uranium isotope left in the container is 2.833 grams given that the half-life of this isotope of uranium is t1/2 = 200,000 years. 

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