A particular drug can be sold until 20% of the original drughas undergone change

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A particular drug can be sold until 20% of the original drughas undergone change. Knowing that k=1.25 x 10-2/day and the change is first order,how long, in days, will it take before the drug can no longer besold? Having all the information that is given, I initially startedwith the rate law expression for a first order reaction: ln[A] =-kt + ln[A]i. After trying this, I realized that it wouldn'twork and then I didnt understand how I would be able to calculatethe amount of days. A particular drug can be sold until 20% of the original drughas undergone change. Knowing that k=1.25 x 10-2/day and the change is first order,how long, in days, will it take before the drug can no longer besold? Having all the information that is given, I initially startedwith the rate law expression for a first order reaction: ln[A] =-kt + ln[A]i. After trying this, I realized that it wouldn'twork and then I didnt understand how I would be able to calculatethe amount of days.

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