Draw the structures for the reactants and products and write balanced molecular equations for the following reactions $($include ALL reagents$)$:

a$.$ Salicylic acid $+$ Acetylsalicylic acid

b$.$ Acetylsalicylic acid $+$ Salicylate ion

c$.$ Salicylate$+$Salicylate$-$iron complex

Calculate the theoretical yield of acetylsalicylic acid starting with $1\mathrm{.}98g$ of salicylic acid and excess acetic anhydride. Show your work.

What is the difference between percent yield and percent composition?