For 1.6 mole of the radioactive isotope iodine-131, half-life=8.1 days, how many disintegrations have occured?

Question

after 10 minutes?

Answer 1

5.72 x 10^20

Answer 2

With a a million/2-existence of 27.8 days the equation could be .5^(x/27.8) the place x is 10minutes switched over to days = 10/60/24 . utilising this training and a calculator i'm getting .000294 Moles have decayed in 10 minutes, then utilising Avagadros form of 6.022 X 10^23 , i'm getting a million.772 X 10^20 decays in 10 minutes.