## Chemistry 9th Edition

each bill weights 2.5 grams and has exactly 4% of the active ingredient. thus, each pill has: 2.5 grams $\times$ $(4\div100)$ = 0.1 grams of Lipitor. Therefore, 100 pills contains $(100 \times 0.1 grams)$ = 10 grams/100 pills. to convert into kilograms as the questions asks: $10 grams \times \frac{1 kg}{1000 grams} = 0.01 kg$