Percentage Yield

The video tutorial explains the concept of percentage yield, which measures the efficiency of a chemical reaction by comparing the actual yield to the theoretical yield. It provides examples using ethene and ethanol, as well as moles in the production of aspirin, to demonstrate how to calculate percentage yield. The tutorial emphasizes the importance of maximizing reaction efficiency in industrial processes and concludes with a summary of key learning outcomes.

What does percentage yield indicate in a chemical reaction?

• The speed of the reaction

• The amount of reactants used

• The efficiency of the reaction

• The color of the products

In the example of ethene and water producing ethanol, what was the theoretical yield of ethanol?

• 42 grams

• 28 grams

• 46 grams

• 18 grams

How is percentage yield calculated?

• Actual yield divided by theoretical yield, multiplied by 100

• Theoretical yield divided by actual yield, multiplied by 100

• Actual yield plus theoretical yield, divided by 100

• Theoretical yield minus actual yield, multiplied by 100

In the aspirin production example, what was the percentage yield?

• 91.3%

• 75%

• 98%

• 100%

Why is a high percentage yield important in industrial processes?

• It speeds up the reaction

• It reduces the cost and waste of reactants

• It decreases the temperature needed

• It increases the color of the product