The half-life of 131I is 80 days. How much of a 500.0 mg sample remains after 3 half lives?

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17 votes

Answer:

62.5 mg

Step-by-step explanation:

Just multiply the original amount by 1/2 three times:

500 mg x 1/2 x 1/2 x 1/2 = 62.5 mg

Greg Price answered Aug 14, 2023

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