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Author Question: The half-life of cobalt-60 is 5.20 y. How many milligrams of a 6.000-mg sample remain after 10.5 years? (Read 70 times)

NguyenJ

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on: Nov 18, 2019

Question 1

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?
◦ 1.56%
◦ 0.78%
◦ 3.12%
◦ 0.391%

Question 2

The half-life of cobalt-60 is 5.20 y. How many milligrams of a 6.000-mg sample remain after 10.5 years?
◦ 24.3 mg
◦ 0.0543 mg
◦ 1.48 mg
◦ 5.75 mg
◦ 0.123 mg
Chemistry: A Molecular Approach (Canadian) ¦ Tro, Fridgen, Shaw ¦ 2nd Edition
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Marked as best answer by NguyenJ on Nov 18, 2019

asdfasdf

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Reply #1 on: Nov 18, 2019
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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NguyenJ

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Reply 2 on: Nov 18, 2019
Thanks for the timely response, appreciate it

jackie

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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