Tuesday

March 31, 2015

March 31, 2015

Posted by **Sarah H** on Friday, March 28, 2008 at 5:34pm.

I got: close to 15 days. Is this right?

I figured that about 1% of the original quantity would be roughly 6.5 Half lives, and since a half life is 2.35 days, 6.58*2.35

- Gen Chem -
**DrBob222**, Friday, March 28, 2008 at 5:52pmIt's done this way for an exact answer.

k = 0.693/t_{1/2}. Substitute k into the following equation and solve for t.

ln(100/1) = kt.

I get 15.6 days.

**Answer this Question**

**Related Questions**

UIW - Neptunium-239 has a half-life of 2.35 days. How many days must elapse for ...

Algebra - Two different radioactive isotopes decay to 10% of their respective ...

CHEM - Pu-239 has a half-life of 24110 y. If 1.00 kg of this isotope is present ...

Math with science - Radioactive iodine treatment is so successful at treating ...

chemistry - The disintegration of a radioisotope, such as I-131 to Xe-131, is ...

CHEMISTRY - Suppose you had a detection device that could count every decay ...

Math - _The_Natural_Base_e_ An accident in 1986 at the Chernobyl nuculear plant ...

calc - The half-life of polonium is 139 days, but your sample will not be useful...

Chemistry - A radioactive element has a half-life of 6.41 days. What percent of ...

chemistry - The half-life for the radioactive decay of calcium-47 is 4.5 days.If...