A student reacts 36g of salicylic acid with 60 mL of acetic anhydride producing 29.5g of acetyl salicylic acid. What is the percent yield of the reaction?

62.82%

Explanation:

From the equation of reaction:

1 mole of salicyclic acid requires 1 mole of acetic anhydride to yield 1 mole of aspirin (acetyl salicyclic acid).

Mass of 1 mole of salicyclic acid = 138.121 g

Mass of 1 mole of acetic anhydride = 102.09 g

Mass of 1 mole of aspirin = 180.158 g

Therefore,

138.121 g of salicyclic acid is supposed to yield 180.158 g of aspiring

36 g of salicyclic acid will yield = 180.158 x 36/138.121

  = 46.957 g of aspiring

But 29.5 g of aspirin was produced.

Hence, percent yield of the reaction = 29.5/46.957 x 100%

= 62.82%

The percentage yield of the reaction is 62.82%.

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