Calculateur d'Énergie d'Activation (Arrhenius)
Calculez l'énergie d'activation avec l'équation d'Arrhenius.
Atom Economy
81.82 %
Atom Economy vs Molecular Weight of Desired Product
Formule
## Atom Economy Atom economy (atom efficiency) measures how much of the reactant atoms are incorporated into the desired product. It is a green chemistry metric independent of yield. ### Formula **Atom Economy = (MW of desired product / sum of MW of all products) × 100%** Reactions with high atom economy produce less waste by design. Addition reactions (100% atom economy) are preferred over substitution or elimination reactions that generate byproducts.
Exemple Résolu
A reaction produces a desired product (MW=180) and a byproduct (MW=40).
- 01Atom economy = (180 / 220) × 100 = 81.82%
- 02Waste fraction = 100 - 81.82 = 18.18%
Questions Fréquentes
How does atom economy differ from percent yield?
Percent yield measures how well a reaction works in practice. Atom economy measures how inherently efficient the reaction is by design. A reaction can have 100% yield but poor atom economy if it produces stoichiometric waste.
What reactions have 100% atom economy?
Addition reactions (like Diels-Alder, hydrogenation) where all atoms of the reactants end up in a single product have 100% atom economy. Rearrangements also have 100% atom economy.
Why is atom economy important in green chemistry?
High atom economy means less waste per unit of product. This reduces raw material costs, waste treatment costs, and environmental impact. It is one of the 12 Principles of Green Chemistry.
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