Chemical Reaction Yields
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Questions and Answers

What is theoretical yield in a chemical reaction?

  • The percentage of reactants converted into products
  • The mass of reactants before the reaction
  • The mass of product actually obtained from a reaction
  • The maximum possible mass of product that could be produced (correct)

    • Percentage yield is calculated by dividing actual yield by theoretical yield and multiplying by 100.

    True

    What is the actual yield if the process was 82% efficient and the theoretical yield is 100 g?

    82 g

    The formula for calculating percentage yield is __________.

    <p>actual yield/theoretical yield × 100%</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Theoretical Yield = A measure of how efficiently reactants are converted to products Actual Yield = The mass of product actually obtained from a reaction Percentage Yield = The maximum possible mass of product in a reaction</p> Signup and view all the answers

    Study Notes

    Chemical Reaction Yields

    • Chemical reactions don't always produce the exact amount of product predicted by balanced equations.
    • Theoretical Yield: The maximum possible mass of product that could be produced.
    • Actual Yield: The actual mass of product obtained from a reaction.
    • Percentage Yield: A measure of how efficiently a reactant is converted to a product. Calculated as (actual yield / theoretical yield) * 100%.

    Example Calculation

    • Reaction: HBrO3 + 5HBr → 3Br2 + 3H2O

    • Given: 10.0 g of HBrO3 reacted with excess HBr; 26.3 g of Br2 produced.

    • i) Moles of Reactant:

      • Calculate molar mass of HBrO3 (128.91 g/mol)
      • Calculate moles of HBrO3 used (10.0 g / 128.91 g/mol = 0.0776 mol)

    • ii) Theoretical Yield:

      • Calculate moles of Br2 produced from moles of HBrO3 (0.0776 mol HBrO3 * (3 mol Br2 / 1 mol HBrO3) = 0.233 mol)
      • Calculate molar mass of Br2 (159.81 g/mol)
      • Calculate theoretical yield (0.233 mol * 159.81 g/mol = 37.2 g)

    • iii) Percentage Yield:

      • Calculate percentage yield (26.3 g / 37.2 g) * 100% = 70.7%

    • Additional Example: If the reaction was 82% efficient, the actual yield would be 30.5g.

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    Related Documents

    Chemical Reaction Yield Calculation PDF

    Description

    Evaluate your understanding of chemical reaction yields, including theoretical and actual yields, as well as percentage yield. This quiz includes calculations and examples relevant to stoichiometry in chemical reactions.

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