salicylic acid molar mass = 138 .12 g/mol
acetic anhydride molar mass = 102 .09 g/mol
acetyl salicylic acid molar mass = 180.16 g/mol
salicylic acid  + acetic anhydride
--------------------> acetyl salicylic acid + H2O
138.12
g                                                                         Â
180.16 g
  96 g
                                                            Â
138.12 g of salicylic acid ---------------------- Â Â
180.16 g of acetyl salicylic acid
      96 g of salicylic acid
---------------------- Â Â ?? acetyl salicylic acid
acetyl salicylic acid = 125.22 g --------------- theoritical
yield
actual yield = 10.7 g
% yield = (actual / theoritical ) x 100 Â Â Â
= (10.7 / 125.22 ) x 100 Â Â Â Â Â
  = 8.54 %
percent yield of the reaction = 8.54 %
                                   Â