Chemistry help on atom economy and percentage yield.Watch
Atom economy = Mass of required product/total mass of reactants X 100
%yield = Mass of moles of product obtained/maximum theoretic mass (or moles)
They are essentially the same thing but they are used in different scenarios.
Hope this helps
The percentage yield is more to do with the conditions in which the reaction is carried out. It measures the proportion of how much product is made (under those conditions) vs the maximum that could have been produced. The maximum is determined by amounts of reactants used.
For a given equation, the atom economy can't change whereas the percentage yield can.
A reaction that produces 5 products will have a low atom economy but could have 100% yield.
The Haber process has 100% atom economy but a low yield because it is reversible.