Posted by Queen on Tuesday, December 7, 2010 at 8:03am.
the concentration of tritium in the wine is 0.34 times that found in the freshly bottled wines. if the half life of the tritium is 12.3 years, estimate the time elapsed since the wine was bottled. help please. thank you :)

Chemistry  MathMate, Tuesday, December 7, 2010 at 8:30am
time
= (half life)*ln(fraction remaining)/ln(2)
= (12.3)*(0.34)/ln(2)
= 19.1 years. 
Chemistry  Queen, Tuesday, December 7, 2010 at 9:09am
thanks a lot :)

Chemistry  brian, Thursday, July 26, 2012 at 12:24pm
Cesium137 has a half life of 30.0 years. If initially there are 8.0 kg of cesium137 present in a sample, how many kg will remain after 60.0 years?