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

Answers (1)

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 is1.42\%

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