Synthesis of Lidocaine percent yield question

Feb 2013
81
2
Calculate the overall percent yield of the synthesis to produce crude lidocaine.

My total weight of crude lidocaine is 0.627g



The limiting reagent in this reaction is diethylamine I believe.

I used 7.5 mL of diethylamine (MW=73.1g/mol ; density= .71g/ml)

7.5mL*(.71g/mL)= 5.33g*(1mol/73.1g) = .073 mol

.073 mol * (197.4 g/mol Lidocaine) = 14.4 grams

Im not sure if this is right, or if I need more steps. Any help appreciated.