# 2.28   Calculate the mass percentage of aspirin  $\inline (C_{9}H_{8}O_{4})$  in acetonitrile $\inline (CH_{3}CN)$ when $\inline 6.5 \; g$ of $\inline C_{9}H_{8}O_{4}$ is dissolved in $\inline 450\; g$ of $\inline CH_{3}CN$.

Total mass of solution = Mass of aspirin + Mass of acetonitrile = 6.5 + 450 = 456.5 g.

We know that :

$Mass\ percentage = \frac{Mass\ of\ solute }{Mass\ of\ solution}\times100$

So,                      $Mass\ percentage = \frac{6.5 }{456.5}\times100 = 1.42\%$

Thus the mass percentage of aspirin is$1.42\%$

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