Answer: The percent yield of the reaction is 8.10 %.
Step-by-step explanation:
To calculate the number of moles, we use the equation:
.....(1)
Given mass of salicylic acid = 0.105g
Molar mass of salicylic acid = 138.12 g/mol
Putting values in equation 1, we get:

The chemical equation for the formation of aspirin from salicylic acid follows:

By Stoichiometry of the reaction:
1 mole of salicylic acid produces 1 mole of aspirin
So, 0.0076 moles of salicylic acid will produce =
of aspirin
Now, calculating the mass of aspirin from equation 1, we get:
Molar mass of aspirin = 180.16 g/mol
Moles of aspirin = 0.0076 moles
Putting values in equation 1, we get:

To calculate the percentage yield of aspirin, we use the equation:

Experimental yield of aspirin = 0.111 g
Theoretical yield of aspirin = 1.37 g
Putting values in above equation, we get:

Hence, the percent yield of the reaction is 8.10 %.