Posted by Monique on .
A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days?
please explain

chemistry 
DrBob222,
k = 0.693/t_{1/2}
Solve for t_{1/2} and substitute into the equation below.
ln(No/N) = kt
No = starting grams = 2.45 g
N = ending amount. Solve for this.
k = from above calculation.
t = 11.5 days. 
chemistry 
Anonymous,
0.30625

chemistry 
saviour,
100g of radioactive mass has a half life of 5days.calculate the mass decayed off aafter 15days

chemistry 
saviour,
100g of radioactive mass has a half life of 5days.calculate the mass decayed off aaftGood day sir, My Name is Oyindamola from Enterprise ware Technologies(Mr Seun AinaScottâ€™s Company)
Please be reminded that your Microsoft Office Account is due to expire on the 22nd August,2016
It has to be renewed so as to prevent the account from being suspended sir
Thanks
Oyinmartins
Support Executive
er 15days