Wednesday

July 30, 2014

July 30, 2014

Posted by **shylo** on Saturday, July 5, 2008 at 5:28pm.

Half-Life

A radium-226 sample initially contains 0.112 mol. How much radium-226 is left in the sample after 6400 years? The half-life of radium-226 is 1600 years.

- Chem 3A -
**drwls**, Saturday, July 5, 2008 at 5:39pm6400 years is 4 half-lives. The amount remaining is

0.112 mol * (1/2)^4

= 0.112/16 = 0.007 mol

**Related Questions**

chemistry - A radium-226 sample initially contains 0.112mol. How much radium-226...

Calculus - The half-life of Radium-226 is 1590 years. If a sample contains 100 ...

nuclear chem - i need help solving this. Can you guys show me how it's done. ...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

Math - In 1976 a research hospital bought half a gram of radium for cancer ...

Math - In 1976 a research hospital bought half a gram of radium for cancer ...

Chemistry - Radium-223 has a half-life of 11.4 days.Approximately how long would...

Math - Exponential Decay - Radium decays exponentially. Its half-life is 1,690 ...

Science - Radium has a half-life of 1620 years and decays into radon, which has...

chemistry - How long will it take for 25% of the C-14 atoms in a sample of C-14 ...