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.

iodine-131xenon-131+electron

The decay is first order with a rate constant of 0.138 d1. All radioactive decay is first order. How many days will it take for 82.0% of the iodine-131 in a 0.900 M solution of this substance to decay to xenon-131?

Select the correct answer below:

12.4 days

0.0130 day

1.44 days

5.94 days