Answer to Question #290021 in Physical Chemistry for Jose

Question

The reaction of benzyl alcohol (10.81 g, 0.10 mol , FW 108.1 g/mol) with p-toluenesulfonyl chloride (21.9 g, 0.114 mol , FW = 190.65) in toluene (500 g) and triethylamine (15 g, FW = 101) produces the ester benzyl p-methylbenzenesulfonate (FW = 262.29), isolated in 90% yield (0.09 mol, 23.6 g) and hydrochloric acid (3.28 g, FW 36.45). Calculate the mass efficiency.

Answer 1

Change the grams into kilograms;

23.6g = 0.0236kg

10.81g = 0.0108kg

21.9g = 0.0219kg

Mass efficiency is therefore;

0.0236÷(0.0108+0.0219)

= 0.721kg/kg