Q28 of 53 Page 59

Calculate the mass percentage of aspirin(C9H8O4) in acetonitrile(CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.

Total mass of solution = 6.5g + 450g = 456.5g

Therefore mass percentage of aspirin in solution = (mass of aspirine/total mass of solution) = 6.5/456.5


⇒ mass % of aspirine = 1.424%


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