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Author Question: Sodium-24 has a half-life of 15 h. How many hours is three half-lives? (Read 69 times)

roselinechinyere27m

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on: Jun 7, 2021

Question 1

The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min?
◦ 1.0 mg
◦ 0.25 mg
◦ 2.0 mg
◦ 4.0 mg
◦ 0.50 mg

Question 2

Sodium-24 has a half-life of 15 h. How many hours is three half-lives?
◦ 7.5 h
◦ 30 h
◦ 60 h
◦ 15 h
◦ 45 h
Chemistry: An Introduction to General, Organic, and Biological Chemistry ¦ Timberlake ¦ 13th Edition
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Marked as best answer by roselinechinyere27m on Jun 7, 2021

honnalora

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Reply #1 on: Jun 7, 2021
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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roselinechinyere27m

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Reply 2 on: Jun 7, 2021
Great answer, keep it coming :)

bimper21

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

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