3.31 A first-order reaction that results in the destruc-

tion of a pollutant has a rate constant of 0.1/day. (a)

How many days will it take for 90 percent of the chem-

ical to be destroyed? (b) How long will it take for 99 per-

cent of the chemical to be destroyed? (c) How long will

it take for 99.9 percent of the chemical to be destroyed?