A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?.

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Dskinner asked Oct 20, 2023

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A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?.

Chemistry
high-school

Dskinner asked Oct 20, 2023

by Dskinner

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2 Answers

6 votes

Answer:

b. 25% unchanged and 75% stable

Step-by-step explanation:

got it right on edge

Jon Skarpeteig answered Oct 23, 2023

by Jon Skarpeteig

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10 votes

Answer:

25% is left 15 gm

Step-by-step explanation:

(1/2)^2 = 25%

Arthur Ronconi answered Oct 26, 2023

by Arthur Ronconi

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