Question

What is the half-life of an isotope if after 14 days you have 31.25 g remaining from a
250.0 g sample?

Answer 1

Answer:

4 2/3 days

Explanation:

31.25   =   250 ( 1/2)^n      solve for n

31.25/250   = 1/2 ^n    log both sides to find n = 3 half lives

14 days = 3 half lives

14/3 = 4 2/3 day half life