Percentage Yield

• What is the term for the amount of product from a chemical reaction?

  Yield
• How can yield be measured?

  In grams or moles
• What does actual yield refer to?

  The amount we actually get from a reaction
• What does theoretical yield describe?

  The yield expected based on calculations
• If 2 grams of hydrogen reacts with 16 grams of oxygen, what is the theoretical yield of water?

  18 grams
• Why might the actual yield be less than the theoretical yield?

  There are several reasons for this discrepancy
• What is one common reason for lower actual yield?

  Reactants might not fully react
• What happens in a reversible reaction regarding yield?

  It may not go to completion
• What is a side reaction?

  Reactants produce a different product
• How can side reactions affect yield?

  They reduce the expected product amount
• What is one way product can be lost during a reaction?

  Gaseous products can escape
• Why might liquid be lost during filtration?

  Some liquid remains in the beaker
• What is the formula for calculating percentage yield?

  (Actual yield / Theoretical yield) × 100
• If the actual yield is 15 grams and the theoretical yield is 18 grams, what is the percentage yield?

  83.3%
• What does a percentage yield of 100% indicate?

  All predicted products were obtained
• What does a percentage yield of 0% indicate?

  No product was obtained from the reaction
• What are the common reasons for lower actual yield in chemical reactions?

  • Reactants might not fully react
  • Side reactions producing different products
  • Loss of product during the process
• How do you calculate percentage yield?

  1. Take the actual yield
  2. Divide by the theoretical yield
  3. Multiply by 100 to get a percentage