Atom Economy Calculator

Atom economy measures how much of the starting materials in a chemical reaction end up in the desired product — a key concept in green chemistry for assessing how wasteful a reaction is. Enter your balanced chemical equation, desired product formula, and product coefficient into the Atom Economy Calculator to get the atom economy percentage and waste percentage. Secondary outputs include the desired product mass and total reactant mass in g/mol.

Enter the complete balanced chemical equation using → or => for the arrow

Enter the chemical formula of the target product

Coefficient of the desired product in the balanced equation

Results

Atom Economy

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Waste Percentage

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Desired Product Mass

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Total Reactant Mass

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Frequently Asked Questions

What is atom economy?

Atom economy is a measure of how efficiently atoms from reactants are incorporated into the desired product. It's expressed as a percentage and indicates how much of the starting materials ends up in the useful product versus waste.

How do I calculate atom economy in green chemistry?

Atom economy = (Mass of desired product / Total mass of reactants) × 100%. You need the molecular weights of all reactants and the desired product, along with their coefficients from the balanced equation.

What is the difference between atom economy and yield?

Atom economy is theoretical and based on the balanced equation, showing maximum possible efficiency. Yield is experimental and shows actual product obtained versus theoretical maximum, accounting for incomplete reactions and side reactions.

Why is a high atom economy better?

High atom economy means less waste production, making chemical processes more environmentally friendly and cost-effective. It's a key principle in green chemistry for sustainable manufacturing.

How do I calculate the atom economy if I know the molecular weights?

Multiply the molecular weight of the desired product by its coefficient, then divide by the sum of all reactant molecular weights multiplied by their coefficients. Convert to percentage by multiplying by 100.

What makes a reaction have 100% atom economy?

A reaction has 100% atom economy when all atoms from the reactants are incorporated into the desired product with no waste products formed. Addition reactions typically have high atom economies.

Can atom economy be greater than 100%?

No, atom economy cannot exceed 100% as it represents the fraction of reactant mass that becomes the desired product. Values above 100% would indicate an error in calculation or equation balancing.