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?

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?

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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Question

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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