Maximum yield of benzocaine that I could obtain from experiment based on the amount of p-toluidine used in step one is 8.2099 g step one calculate the % yield of n-acetyl-p-toluidine MW: 149.19g/mol, if im starting with 5.33g of p-toluidine MW: 107.16 g/mol. (mass not recorded) step 2 n-acetyl-p-toluidine to p-acetamidobenzoic acid MW: 179.17g/mol . mass obtained 2.18 g step 3 starting with 2.18 g of p-acetamidobenzoic acid to p-aminobezoic acid MW: 137.14 g/mol. step 4 starting with 1.215 g of p-aminobenzoic acid to ethyl p-aminobenzoate MW: 165.19 g/mol. mass of ethyl-p-aminobenzoate obtained 0.831 g