carbon 14 has a half life of 5715 years. If you start with a 5 gram sample of 14C, what mass is left after 15,000 years?

Answer 1

k = 0.693/t_1/2
solve for k.

ln(No/N) = kt
No = 5.00 g
N = ?
k from above.
t = time in years = 15,000

Answer 2

Thank you so much.