Calculate the percent yield of aspirin if 4.55 grams of aspirin is produced when 5.22 grams of salicylic acid is reacted with excess acetic anhydirde.

Question

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with the correct number of significant figures and units.

Answer 1

Salicylic acid + Acetic anhydride → Aspirin + Acetic acid

Reaction proceeds in a 1:1 mole ratio between reactants and products.

Using the starting mass of Salicylic acid, use stoichiometry to calculate the theoretical yield of aspirin. Molar mass of salicylic acid and aspirin are 138.12 g/mol and 180.16 g/mol, respectively.

5.22 g salicylic acid x (1 mol salicylic acid / 138.12 g salicylic acid) x (1 mol aspirin / 1 mol salicylic acid) x (180.16 g aspirin / 1 mol aspirin) = 6.81 g aspirin (to 3 significant figures)

4.55 g of aspirin was produced from the reaction, which is your actual yield.

%-Yield = (Actual yield / Theoretical yield) x 100%

= (4.55 g / 6.81 g ) x 100% = 66.8% (to 3 significant figures)