Anonymous asked in Science & MathematicsChemistry · 1 decade ago

Stoichiometry questions?

How do you determine a limiting reactant using the factor-label method?

1 Answer

  • Anonymous
    1 decade ago
    Favorite Answer

    You need to determine the amount of moles you have of each reactant, then divide by it's stoichiometric coefficient. This will give the ratio of mols per molecule. The reactant with the lowest ratio is then the limiting reagent.


    If the reactants are: H20 + 2O2 and you have 2g of Water, and 3grams of Oxygen then,

    Mols H20 : 2/18 = 0.1 mol

    Mols O2: 3/32 = 0.094 mol

    H20 ratio: 0.1/1 = 0.1 mol/molecule

    O2 ratio: 0.094/2 = 0.047 mo/molecule

    Therefore 0.047<0.1 and O2 becomes the limiting reagent.

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