Saturday

March 28, 2015

March 28, 2015

Posted by **Anonymous** on Wednesday, December 12, 2012 at 10:35pm.

Half-live of Indium-116 is 14 seconds. How long will it take for 32 grams of this istotopw to decay to 1.0 grams. I know the answer is 70seconds but do not know how to get it!

- Chemistry -
**TutorCat**, Wednesday, December 12, 2012 at 11:20pmEvery 14 seconds, the isotope's mass is halved.

- Chemistry -
**DrBob222**, Wednesday, December 12, 2012 at 11:42pmYou can iterate as TutorCat suggests, or you can follow this formula

k = 0.693/t_{1/2}

Solve for k and substitute it into the equation below.

ln(No/N) = kt

No = 32

N = 1

k from above.

solve for t.

**Answer this Question**

**Related Questions**

Chemistry - How to work out: The half-life of Indium-116 is 14 seconds. How long...

Chemistry - Which radioactive sample would contain the greatest remaining mass ...

chemistry - You have 11.20 grams of a compound. It is known that the compound ...

Chemistry - You have 11.20 grams of compound. It is known that the compound has ...

chemistry - If there are 80 milligrams of a radioactive element decays to 10 ...

Chemistry - K-42 has a half-life of 12.4 hours. If you begin with 250g of K-42, ...

Physics HELP HELP - (for some reason I keep getting this wrong. I put 90 for c, ...

Chemistry - About twenty radioisotopes with ultra-long half-lives, from 82 ...

algebra - 1) how many billions of years will it take 1000 grams of uranium-238 ...

Algebra 2 - half life carbon -14 is 5,730 years. If you start out 50 grams, how ...