Atom economy calculator
Unlike percent yield, atom economy is a property of the equation itself: it is fixed before you run anything.
g/mol
g/mol
Atom economy
52.63%
- Mass discarded as by-product
- 47.37 %
Show the working
- Molar mass of desired product = 180.16
- Total molar mass of all reactants = 342.3
- Atom economy = 180.16 / 342.3 * 100 = 52.6322
- Mass discarded as by-product = 100 - 52.6322 = 47.3678
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- atom economy = molar mass of product / sum of molar masses of reactants x 100
Addition reactions can reach 100%; substitutions and eliminations cannot.