## Chemistry (7th Edition)

This is the mass percent of each element in acetaminophen: Carbon: $63.56\%$ Hydrogen: $6.00\%$ Nitrogen: $9.27\%$ Oxygen : $21.17\%$
1. Calculate the total weight of the atoms: Molecular weight ($C_8H_9NO_2$): C: 12.01* 8 = 96.08 H: 1.008* 9 = 9.072 N: 14.01* 1 = 14.01 O: 16.00* 2 = 32.00 96.08 + 9.072 + 14.01 + 32.00 = 151.16 u. 2. Using the calculated values, find the mass percent in each case: $mass\% = \frac{totalmass(Element)}{totalmass(Molecule)} \times 100\%$ C: $\frac{96.08}{151.16} \times 100\% = 63.56\%$ H: $\frac{9.072}{151.16} \times 100\% = 6.00\%$ N: $\frac{14.01}{151.16} \times 100\% = 9.27\%$ O: $\frac{32.00}{151.16} \times 100\% = 21.17\%$