Percentage yield
Percentage yield
Formula
% yield = (actual mass / theoretical mass) × 100
Real World
Pfizer reported yields below 70% during early paracetamol synthesis trials, prompting process redesign to reduce product loss during recrystallisation and filtration steps.
Exam Focus
Calculate theoretical yield from the limiting reagent only; using the wrong reactant is the most frequent error in multi-step yield questions.
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