Question

A 208g sample of sodium-24 decays to 13.0g of sodium-24 within 60.0 hours. What is the half life of this radioactivity isotope?

Answer 1

15 hours

Step-by-step explanation:

formula: f(a) = a(0.5)^(T/t)

fill in known values: 13=208(0.5)^(60/t)

use natural log to isolate t: ln(13/208)=ln(0.5)(60/t)

solve for t: t=15