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