# Answer to Question #48320 in Other 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.Need a fast expert's response?

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## Comments

Assignment Expert11.06.18, 16:39Dear Pont Jeckson please post the new question.

Pont Jeckson10.06.18, 18:44Thanks 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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