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An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its half-life?
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An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its half-life?

User Tiep Phan
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2 Answers

6 votes
1.25, you divide 2.5 by 80, then times by 40
User Sagar Kothari Turvo
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3 votes

the answer on edg is 8 days

User Catia
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