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Question
Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.
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Solution
Given: Mass of aspirin = 6.5 g
Mass of acetonitrile = 450 g
Mass percent of aspirin = `"Mass of aspirin"/("Mass of aspirin" + "Mass of acetonitrile") xx 100`
= `6.5/(6.5 + 450) xx 100`
= `6.5/456.5 xx 100`
= 1.424%
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