How do you determine a limiting reactant using the factor-label method?
- Anonymous1 decade agoFavorite 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.