explain how the yield, purity and atom economy of the substances prepared may be affected by changes to the methods used

Question

I need help with this experiment how do I relate this to ethyl ethanoate and aspirin experiment 

Answer 1

Without additional information, it's difficult to answer this.  The ethyl ethanoate to which you refer must be the solvent used since it is not used in the synthesis of aspirin.  The yield and purity can be affected by several variables such as temperature, concentrations of reactants, solvent, etc.  The atom economy will also be related to the yield and the purity. But again, without more info, it's difficult to make specific suggestions.