One aspirin pill contains 360 mg of aspirin. To form 10 pills of aspirin from salicylic acid and acetic anhydride, how many grams of salicylic acid is required?

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Solution

Molar mass of salicylic acid = 138
Molar mass of aspirin = 180
10 pills of aspirin = 3600 mg of Aspirin = 3600/180 = 20 mmol of aspirin
Mass of salicylic acid required = 20 × 138 = 2760 mg = 2.76 gm of salicylic acid

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Write the chemical equation to convert salicylic acid to aspirin.