What total mass of a 16 gram sample of 60co will remain unchanged after 15.8 years?

Answer 1

k = 0.693/t_1/2
Substitute t_1/2 (in years) into the above and calculate k. Then substitute k into the below equation and solve for N.
ln(No/N) = kt
No = 16
N = solve for this.
k = from above.
t = 15.8 years.
The answer is close to 2 grams.