44 of 48 If the half-life of a radioisotope is 3 years, the radioactivity remaining in a sample of it after six years is 0% 6.25% 12.5% 25% 45 of 48 For a radioisotope where k=1.7x104yr1, how old is a sample when only 10% remains? 5,900 years 590 years 2,600 years 14,000 years 46 of 48 Pu-241 could be used for nuclear fusion in galvanic cells for fuel cells in a conventional nuclear reactor

44 of 48 If the half-life of a radioisotope is 3 years, the radioactivity remaining in a sample of it after six years is 0% 6.25% 12.5% 25% 45 of 48 For a radioisotope where k=1.7x104yr1, how old is a sample when only 10% remains? 5,900 years 590 years 2,600 years 14,000 years 46 of 48 Pu-241 could be used for nuclear fusion in galvanic cells for fuel cells in a conventional nuclear reactor

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The table below shows the radioactive decay of a 600 g sample of Iodine-125. % of Parent Isotope Remaining Time Half- Fraction of Parent (days) Lives Isotope Remaining Mass (g) of Parent Mass (g) of Daughter Isotope Isotope 100% 1/1 600 60 1 50% 1/2 120 300 300 25% 1/4 150 450 180 3 12.5% 1/8 75 525 240 4 6.25% 1/16 37.5 562.5 300 3.125% 1/32 18.75 581.25 360 1.56% 1/64 9.4 590.6 15. What percent of iodine is left if 5 half-lives have passed? 16. What percent of iodine-125 has decayed if there are 37.5 grams of the original sample left? 17. What is the half-life of Iodine-125? 18. What mass of the Iodine-125 has decayed after 6 half-lives? 19. What fraction of the Iodine-125 remains after 300 days have passed? 20. How many half-lives would have to pass for there to be only 1.2 grams remaining? 21.How many grams of the daughter isotope are there after three half-lives?
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All the disintegrations of a sample of an unknown nuclide weighing 4.6 x 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 x 1020. What is the atomic weight of the unknown element?
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