To save time in typing let's call salicylic acid something like SA. The molar mass of SA is 138.1 but you should confirm that.
mols SA = grams/molar mass = 5.10/138 = about 0.037 but you should recalculate and add another significant figure.
Looking at the equation, 1 mol SA produces 1 mol aspirin so you will get 0.037 mols aspirin. g aspirin = mols aspirin x molar mass aspirin = ?. This is the theoretical yield (TY).
b. The actual yield (AY) is 5.10 grams. %yield = (AY/TY)*100 = ?
Post your work if you get stuck.
Aspirin (C9H8O4) can be prepared by the reaction of salicylic acid (C7H6O3) with acetic anhydride (in
excess) in the presence of phosphoric acid as catalyst. Initially 5.1 g salicylic acid was used, after
purification; 5.10 g of solid (Aspirin) was collected.
(a) Calculate the theoretical yield. (6 marks)
(b) Calculate the percentage yield for aspirin. (4 marks)
The following equation is balanced as follow:
Salicylic Acid(C7H6O3) Acetic Anhydride Aspirin(C9H8O4) Acetic Acid
1: 1 :1 :1
1 answer
1 answer