(Solved): Iodine- 131 is a radioactive isotope that is used to diagnose and treat some forms of thyroid cance ...

Iodine- 131 is a radioactive isotope that is used to diagnose and treat some forms of thyroid cancer. Iodine-131 decays to xenon-131. according to the equation below. $$\text{ iodine-131 }?\text{ xenon-131 + electron }$$ The decay is first order with a rate constant of $$0.138{\mathrm{d}}^{?1}$$. All radioactive decay is first order. How many days will it take for $$37.0\%$$ of the iodine-131 in a $$0.700\mathrm{M}$$ solution of this substance to decay to xenon-131? Select the correct answer below: $$3.35$$ days $$7.20$$ days $$0.0457$$ day $$2.68$$ days