percentage yeild

• What is the theoretical yield in a chemical reaction?

  The maximum possible mass of product
• What does the theoretical yield assume about a chemical reaction?

  That the reaction goes to completion with no loss
• What are the steps to calculate the theoretical yield?

  1. Use a balanced chemical equation for mole ratio
  2. Calculate moles of the limiting reagent
  3. Determine mass of product from limiting reagent
• In the reaction C2H5OH + [O] ➔ CH3CHO + H2O, what is the mole ratio of C2H5OH to CH3CHO?

  1 : 1
• What is the actual yield in a chemical reaction?

  The mass of product actually produced
• Why is the actual yield always less than the theoretical yield?

  Due to incomplete reactions and product loss
• What factors can cause the actual yield to be lower than the theoretical yield?

  • Incomplete reactions
  • Product loss during workup
  • Side reactions occurring
• If 5.94 g of CH3CHO was collected, what is this value referred to as?

  The actual yield
• What does percentage yield indicate about a chemical reaction?

  How efficient the reaction is
• What is the formula to calculate percentage yield?

  Percentage yield = (actual yield / theoretical yield) × 100
• What is considered a high yield percentage in a reaction?

  A yield above 90%
• What does a lower yield percentage suggest about a chemical process?

  That the process needs optimisation