Salicylic Acid and Acetic Anhydride --> Acetylsalicylic Acid and Acetic Acid C7H

Question

Salicylic Acid and Acetic Anhydride --> Acetylsalicylic Acid and Acetic Acid C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O2 Salicylic Acid - 1.75g 1.6 equivalents of acetic anhydride for every equivalent of salicylic acid. Volume of salicylic acid = 1.22ml Molecular weight of salicylic acid = 138g/mol Mmol of salicylic acid = 12.7 mmols Density of salicylic acid = 1.44g/ml Acetic Anhydride - ?g Molecular weight of acetic anhydride = 102g/mol Density of acetic anhydride = 1.08g/ml What is the mass for acetic anhydride?

Explanation / Answer

This is an equimolar reaction: salicylic acid (C7H6O3) + acetic anhydride (C4H6O3) --> acetylsalicylic acid (C9H8O4) + acetic acid (C2H4O2) Grams acetic anhydride = (Molar mass (acetic anhydride)) * (Moles acetic anhydride) But (Moles acetic anhydride) = (Moles salicylic acid) Grams acetic anhydride = (Molar mass (acetic anhydride)) * (Moles salicylic acid) = (Molar mass (acetic anhydride)) * (Grams salicylic acid/(Molar mass (salicylic acid)) Molar mass (acetic anhydride) = 102.09 g/mole Molar mass (salicylic acid) = 138.12 g/mole Therefore, Grams acetic anhydride = (Molar mass (acetic anhydride)) * (Grams salicylic acid/(Molar mass (salicylic acid)) = (102.09)*(2.10 * 10^2)/(138.12) = 155 g

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