Discussion
The E-factor of a process is the mass of
Answer: D
Correct answer: waste per unit mass of product
The E-factor is kilograms of waste per kilogram of product, so a low figure is good and zero would be perfect. It rises from about 0.1 in bulk petrochemicals to 25 or more in fine chemicals and often above 100 in pharmaceuticals, which is what first drew attention to how wasteful complex syntheses are.
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