A pediatric tablet contains 125 mg of aspirin (

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

\mathrm{C_9H_8O_4}

, molar mass 180.16 g mol

^{-1}

). Approximately how many aspirin molecules does the tablet deliver? (a)

2.3 \times 10^{20}

molecules (b)

4.2 \times 10^{20}

molecules (c)

4.2 \times 10^{23}

molecules (d)

7.5 \times 10^{20}

molecules