Hey everyone
I was wondering if I could get a little help on a question, it would be much appreciated!
The radioactive decay of tritium (^3H) follows first order kinetics with a half life of 12.3 years. If a 10mg sample of hydrogen contanins 2.2 mg of tritium, how much tritium would remain after 6.15 years?
The answer is supposed to be 1.6 mg.
I'm having trouble actually approaching the problem, since its first order I used the information for tritium in the t1/2= ln2/k formula and then use k in the ln[At]=-akt + ln[A0] where a=1, k=0.480 t=6.15 and [A0]=2.2 mg.
I've tried doing that but I dont get the right answer. Any help would be much appreciated, thank you