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**Another radioisotope of iodine, ^{131}I, is also used to study thyroid function (see Follow-up Problem 16.7A). A patient is given a sample that is 1.7 x 10^{−4} M ^{131}I. If the half-life is 8.04 days, what fraction of the radioactivity remains after 30. days?**

__Follow-up Problem 16.7A__. Iodine-123 is used to study thyroid gland function. This radioactive isotope

breaks down in a first-order process with a half-life of 13.1 h. What is the rate constant

for the process?