Sunday

December 28, 2014

December 28, 2014

Posted by **Jay** on Friday, May 6, 2011 at 11:20am.

- Chemistry -
**DrBob222**, Friday, May 6, 2011 at 6:24pmk = 0.693/t

_{1/2}

Substitute k into the equation below.

ln(No/N) = kt

No = 1.6878

N = 0.8671

k fro above.

Solve for t (in seconds) and change to years.

- Chemistry -
**Jude**, Friday, May 6, 2011 at 8:21pmThank you so much DrBob222

**Answer this Question**

**Related Questions**

College Chemistry - How much time in years (assume a 365 day yr) would it take ...

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

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

MATH! - The mass of a radioactive substance follows an exponential decay model, ...

word problem - The half life of cesium-137 is 30 years. Suppose we have a 10-g ...

Math - The half-life of strontium-90 is 28 years. How long will it take a 60 mg ...

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

Chemistry - How many years will it take for 88g tritium to decay to an 11g ...

chemistry - A sample of water is analyzed and found to contain 18.6 ppb of ...

calculus - The rate at which an amount of a radioactive substance decays is ...