## Chemistry: The Central Science (13th Edition)

About 2.778 $\times$ $10^{-3}$ mol of aspirin.
1. Calculate the molar mass of aspirin ($C_{9}H_{8}O_{4}$) C: 12 * 9 = 108 H: 1 * 8 = 8 O: 16 * 4 = 64 108 + 8 + 64 = 180g/mol 2. Find the number of Mols in 0.5g of aspirin. molar mass = $\frac{mass(g)}{mol}$ 180 = $\frac{0.5}{mol}$ mol = $\frac{0.5}{180}$ mol = 0.002777...