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How to calculate Percent yield:
Write the chemical equation. Record the mass of each of your starting materials.
Convert the mass to moles by dividing by molar mass
Divide the # moles of one reactant by the other (experimental ratio)
Divide the coefficient of one reactant by the other (stoichiometric ratio)
If the stoichiometric ratio is larger, then the numerator is the limiting reagent.
Predict the theoretical yield by multiplying # moles limiting reagent by the ratio: product's coefficient/limiting reagent's coefficient
Run your process
Gather the purified product. Measure and record its mass.
Convert mass to moles product. This is the experimental yield.
Calculate the percent yield by dividing experimental/theoretical x 100.
*If your final product is impure, your experimental yield may be higher than the theoretical yield. If this is the case, dessicate your product for an additional five minutes.
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