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Percentage Yield

Percentage yield compares actual and theoretical yield

  • The amount of product you get is known as the yield

  • The more reactants you start with, the higher the actual yield will be

    • But the percentage yield doesn’t depend on the amount of reactants you started with, it’s a percentage

    • Percentage yield = mass of product actually made(g) / maximum theoretical mass of product x 100

      • Maximum theoretical mass can be calculated using balanced reaction equation

  • Percentage yield is always somewhere between 0 and 100%

  • 100% yield means that you get all the product you expected to get

  • 0% yield means that no reactants were converted into products

  • Industrial processes should have as high a percentage yield as possible to reduce waste and reduce costs

Yield are always less than 100%

  • In real life, you never get a 100% yield

  • Some products or reactant always gets lost along the way, and that goes fr big industrial process as well as school lab experiments

  • Depends on what sort of reaction it is and what apparatus is being used

Not all reactants react to make a product

  • In reversible reactions the products can turn back into reactant so the yield will never be 100%

    • For example, in the Haber process at the same time as the reaction N2 + 3H2 - 2NH3 is taking place, the reverse reaction is also happening

    • This means it never goes to completion

Percentage Yield

Percentage yield compares actual and theoretical yield

  • The amount of product you get is known as the yield

  • The more reactants you start with, the higher the actual yield will be

    • But the percentage yield doesn’t depend on the amount of reactants you started with, it’s a percentage

    • Percentage yield = mass of product actually made(g) / maximum theoretical mass of product x 100

      • Maximum theoretical mass can be calculated using balanced reaction equation

  • Percentage yield is always somewhere between 0 and 100%

  • 100% yield means that you get all the product you expected to get

  • 0% yield means that no reactants were converted into products

  • Industrial processes should have as high a percentage yield as possible to reduce waste and reduce costs

Yield are always less than 100%

  • In real life, you never get a 100% yield

  • Some products or reactant always gets lost along the way, and that goes fr big industrial process as well as school lab experiments

  • Depends on what sort of reaction it is and what apparatus is being used

Not all reactants react to make a product

  • In reversible reactions the products can turn back into reactant so the yield will never be 100%

    • For example, in the Haber process at the same time as the reaction N2 + 3H2 - 2NH3 is taking place, the reverse reaction is also happening

    • This means it never goes to completion

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