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How much salicylic acid does aspirin contain?

How much salicylic acid would be required if only 53% of the salicylic acid is converted to aspirin?

  • Aspirin, C9H8O4, is produced from salicylic acid, C7H6O3, and acetic anhydride, C4H6O3, as shown below. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 (b) How much salicylic acid would be required if only 53% of the salicylic acid is converted to aspirin? (c) What is the theoretical yield of aspirin if 159 kg of salicylic acid is allowed to react with 149 kg of acetic anhydride? (d) If the situation described in part (c) produces 163 kg of aspirin, what is the percentage yield?

  • Answer:

    b) 1/0.53 = 206% c) Calculate moles of C7H6O3 and C4H6O3 to determine which is limiting reagent. d) 1 mole of limiting reagent above gives one mole of product (from your equation), so calculate theoretical yield on that basis then compare practical yield: % yield = practical yield/theoretical yield x 100 If you need more help, re post or email me.

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