The half-life of plutonium-239 is 24 300 years. if 8 kilograms of this isotope is stored, how many years would pass before the radiation is 1/8 of the initial amount?
a 48 600 years
b 12 200 years
c 24 300 years
d 72 900 years

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound