How to Calculate Atom Economy
Evaluate reaction efficiency for green chemistry applications:
Find Product Molar Mass
Calculate total molar mass (g/mol) of the desired product.
Sum Reactants Molar Mass
Sum molar masses of all starting reactants (including coefficients).
Apply % AE Formula
Divide product mass by reactant sum mass and multiply by 100%.
Assess Green Chemistry
Addition reactions achieve 100% atom economy; substitution/elimination generate waste.
Key Features & Principles
12 Principles of Green Chemistry
Direct implementation of Paul Anastas' 2nd Green Chemistry Principle.
Byproduct Waste Percent
Quantifies percentage of atom mass lost as non-useful byproduct waste.
Synthetic Pathway Comparisons
Helps industrial chemists choose pathways with minimal waste.
Green Chemistry Guide: Atom Economy vs Percent Yield
While traditional Percent Yield measures how efficiently an experiment is carried out in the laboratory, Atom Economy measures how inherently efficient the chemical reaction design is at incorporating reactant atoms into the desired molecule.
A reaction can have a 100% experimental yield but a very poor atom economy if large stoichiometric quantities of unwanted byproduct waste (such as salts or water) are produced.
Frequently Asked Questions
?Which reaction types have 100% atom economy?
Addition reactions (such as hydrogenation or hydration) and rearrangement reactions always have 100% atom economy because all reactant atoms end up in a single product molecule.