Posted by **Anonymous** on Thursday, October 14, 2010 at 4:06pm.

half life of tritium is 12.5 years. how much will remain after 100 years if you started wit 256 grams?

- Chemistry -
**DrBob222**, Thursday, October 14, 2010 at 4:32pm
First determine k.

k = 0.593/t^{1/2}, then substitute the value of k into the equation below.

ln(256/N) = k(100)

Solve for N in grams.

- Chemistry -
**Anonymous**, Thursday, October 14, 2010 at 4:40pm
Thanks so much!

- corr'n--typos--Chemistry -
**DrBob222**, Thursday, October 14, 2010 at 4:56pm
I made two typos. k = 0.693/t_{1/2}

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