After you ran reaction with 2g of ferrocene (MW= 186 g/mol), 2mL of acetic anhydride (density= 1.082 g/mL, MW= 102 g/mol) as well as 0.2mL of 85% HCl, you obtained 2.1 g of acetylated ferrocene MW= 228 g/mol. Explain what is the theoretical yield of the reaction?