The synthesis of phenylalanine from benzyl chloride and ammonia can be represented by the following balanced chemical equation:C6H5CH2Cl + 2 NH3 C6H5CH2NH2 + NH4ClIn this reaction, 1 mole of benzyl chloride C6H5CH2Cl reacts with 2 moles of ammonia NH3 to produce 1 mole of phenylalanine C6H5CH2NH2 and 1 mole of ammonium chloride NH4Cl .Therefore, the exact stoichiometric ratio of benzyl chloride to ammonia required for the preparation of 1 mole of phenylalanine is 1:2, assuming complete conversion and a yield of 100%.