Free · Stoichiometry calculators 🧪

Product Mass Share and Stoichiometric Atom Economy

Compare desired-product mass with total reagent mass or compute the stoichiometric molar-mass share.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A desired product mass of 60 g out of 100 g reagent input gives a 60% mass share.

Atom economy = coefficient × desired-product molar mass / sum(coefficient × reagent molar mass)

Worked example

Enter these known values and leave the other values blank.

I know...
the masses
Number of reagents
2
Reagent 1
40 g
Reagent 2
60 g
Desired product
60 g
Reagents (total)
100 g
Atom economy
60 %

Assumptions and limitations

  • The mass-input branch is a measured mass share and can include yield/loss effects. True theoretical atom economy uses the balanced reaction and stoichiometric molar-mass branch.
  • Include all consumed reagents in the denominator, not catalysts or solvents that are recovered unchanged. Atom economy is distinct from reaction yield, solvent use or a full environmental assessment.

Common questions

What does this model assume?

The mass-input branch is a measured mass share and can include yield/loss effects. True theoretical atom economy uses the balanced reaction and stoichiometric molar-mass branch.

Can I solve backward?

Clear the unknown value and enter compatible known values. Choices, one-way outputs and singular boundary cases cannot always be inverted.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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