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Answer to Question #48320 in General Chemistry for Courtney
Question #48320
How long will it take for a 40.0 gram sample of I-131 (half life = 8.040 days) to decay to 1/100 its original mass?
Expert's answer
1/100= 0.01. Suppose that n – is number of half lifes, then (1/2)n = 0.01 then n = 6.64. So, the time is 6.64*8.040 = 53.4days.
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Comments
Dear Debora, please post a new question
Initially the mass was 42 grams. After only 10 years, 7 grams remained, assume exponential decay. How long did it take the mass to decrease to 30 grams?
Dear Farrah (1/2)^n = 0.01 where fron n = 6.64
Where is that 6.54 coming from?
Dear Pont Jeckson please post the new question.
Thanks for the answers, but I'm not getting how you arrived at that answer and where is that 6.64 coming from? May you please show me the procedures on how you managed to work it out!
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