a factor of 8, it means that A is now only 1/8 of its original concentration. A first order reaction, where A → products, has a
rate constant of 1.56 × 107 s −1 . At some time, a concentration of 1.06 × 10−6 M of species A is introduced into the reactor. How long does it take for the concentration of A to fall by a factor of 8?