Question

iodide-131 decays with half life of 8.02 d. In a Sample initially containing 5.00 mg of I 131, what mass remains after 6.01 d?

Answer 1

You can use the equation f(t) = 5*(1/2)^(t/8.02)

Then plug in 6.01 for time.There remains 2.97 mg in the sample.