4.3 Percent Yield

Chem 1402:General Chemistry I · LibreTexts

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    Vocabulary

    Exercise \(\PageIndex{1}\)

    1. What is the difference between the theoretical yield and the actual yield?

    2. What is the difference between the actual yield and the percent yield?

    Answer
    1. Theoretical yield is what you expect stoichiometrically from a chemical reaction; actual yield is what you actually get from a chemical reaction.
    2. Actual yield is what you actually get from a chemical reaction; percent yield is the percent ratio of actual yield to the theoretical yield, meaning it is a ratio that determines the accuracy of the actual yield from an experiment.

     

    Percent, Actual, and Theoretical Yield

    Exercise \(\PageIndex{2}\)

    A worker isolates 2.675 g of SiF4 after reacting 2.339 g of SiO2 with HF. What are the theoretical yield and the actual yield? What is the percent yield?    

    SiO2(s) + 4HF(g) → SiF4(g) + 2H2O(ℓ)

    Answer

     

    theoretical yield = 4.052 g; actual yield = 2.675 g

     

    percent yield = 66.02%

    Exercise \(\PageIndex{3}\)

    A chemist decomposes 1.006 g of NaHCO3 and obtains 0.0334 g of Na2CO3. What are the theoretical yield and the actual yield? What is the percent yield?

    2NaHCO3(s) → Na2CO3(s) + H2O(ℓ) + CO2(g)

    Answer

     

    theoretical yield = 0.635 g; actual yield = 0.0334 g

     

    percent yield = 5.26%

     

    4.3 Percent Yield is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.