StoichiometryHESI A2 cheat sheet

Recipe ratios in reactions

9 key facts Reviewed Oct 2026

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The Idea

Balanced coefficients give the mole ratio between substances
2H₂ + O₂ → 2H₂O means 2 mol H₂ per 1 mol O₂

The Steps

Balance the equation
Convert the given amount to moles
Apply the mole ratio
Convert to the requested unit

Limiting Reactant

The one that runs out first caps the product
Compute product from each reactant; the smaller answer wins

Yield

Percent yield = actual / theoretical × 100

Key takeaway

Recipe ratios in reactions

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