STEMORIA scientific instrument

Stoichiometry Workbench

Explore balanced-reaction mole ratios, limiting reactants, reaction extent, product amount, and excess reactant.

Chemistry

Manipulate

Measure

Interpret

2D interactive

Scientific viewport

Measured model and controls

deterministic interaction

Linked scientific model

Reaction Workspace

Move one reaction through a deterministic learning chain: enter formulas, balance atoms, quantify mole inventory, identify the limiting reactant, calculate theoretical or percent yield, then inspect the calculation logic.

I3 · reaction stoichiometry workflowone state · synchronized views

Primary scientific view

Reaction flow

live model output

Input

Balance

Quantify

Limit

Yield

Explain

Balanced reaction

2H2 + O2 → 2H2O

Atom conservation passed for the parsed formula model.

Quantify & limit

ξ from A

1.5 mol

ξ from B

1 mol

Reaction extent

1 mol

Limiting state

Reactant B

ξA = nA / νA = 3 / 2 = 1.5 mol

ξB = nB / νB = 1 / 1 = 1 mol

ξ = min(ξA, ξB)

Yield state

Theoretical product

2 mol

Percent yield

not supplied

A remaining

1 mol

B remaining

0 mol

Explain the calculation

1Balance: 2H2 + O2 → 2H2O. Element counts are conserved across the parsed formulas.
2Quantify: ξA = 3 / 2 = 1.5 mol; ξB = 1 / 1 = 1 mol.
3Limit: ξ = min(ξA, ξB) = 1 mol. Reactant B is limiting because its available reaction extent is smaller.
4Yield: theoretical product = ξ × 2 = 2 mol.
5Actual product amount is not supplied, so percent yield is intentionally left undefined.

Scientific boundary

This v1 balances exactly two reactant formulas into one product formula using integer coefficients from 1 to 24. Supported formula syntax is element symbols, integer subscripts and parentheses; charges, ionic equations, hydrates, phases, multiple products and redox half-reaction logic are intentionally rejected rather than guessed.

Quantities are amount of substance in mol only. The workspace does not silently convert mass to moles because that would require an explicit molar-mass source and formula identity contract.

Stoichiometric feasibility does not establish thermodynamic feasibility, kinetics, equilibrium conversion, selectivity, purity or experimental recovery.