Question

Calculate the mass percentage of aspirin $(C_9H_8O_4 )$ in acetonitrile $(CH_3CN)$ when 6.5 g of $C_9H_8O_4$ is dissolved in 450 g of $CH_3CN.$

Answer 1

6.5 g of $C_9H_8O_4$ is dissolved in 450 g of $CH_3CN$.
Then, total mass of the solution = (6.5+ 450) g
= 456.5 g
Therefore, mass percentage of $C_9H_8O_4 = (\frac{6.5}{456.5}) \times100$
$= 1.424\%$