Question

How do I find the Actual Yield and the Percent Yield if I have the mass of salicylic acid as 1.46 g, volume of acetic anhydride as 3 mL, mass of acetic anhydride as 3.24 g, and theoretical yield of aspirin as 1.90 g/mol?

Answer 1

write the balanced equation
Find how many moles you use on input
The equation will tell you how many moles to expect on output
divide what you got by what you expected for % yield

Answer 2

Let me point out a number of problems with this post.
1. A theoretical yield of 1.90 g/mol makes no sense. You must have meant 1.90 grams.
2. The only way you get an actual yield is if the problem tells you or if you do the actual experiment. Frankly, I suspect the 1.90 above is the actual yield and you are to calculate theoretical yield from oobleck's post. From that you can calculate % yield.