The activity of the antibiotic penicillin slowly decomposes when stored in a buffer at pH 7.0, 298K. The time dependence of the penicillin antibiotic activity is. Time (weeks) Penicillin Activity 0 10100 1 8180 2 6900 3 5380 5 3870 8 2000 10 1330 12 898 15 403 20 167 what is the rate law for this reaction that is, what is the order of the reaction with respect to the penciillin concentration? (b) calculate the rate constant from the data