Percentage yield

The video tutorial explains the concept of percentage yield, a measure of the efficiency of a chemical reaction. It describes how to calculate percentage yield by dividing the actual yield by the theoretical yield and multiplying by 100. The importance of a high percentage yield in biofuel production from sugar cane is highlighted, with an example showing the theoretical and actual yields of ethanol from sucrose.

What is percentage yield a measure of in a chemical reaction?

• The speed of the reaction

• The temperature of the reaction

• The color change in the reaction

• The efficiency of the reaction

How is percentage yield calculated?

• By subtracting the actual yield from the theoretical yield

• By dividing the actual yield by the theoretical yield and multiplying by 100

• By adding the actual yield to the theoretical yield

• By dividing the theoretical yield by the actual yield and multiplying by 100

In the given example, what is the percentage yield if the theoretical yield is 65 grams and the actual yield is 26 grams?

• 40%

• 60%

• 30%

• 50%

Why is a high percentage yield important in the production of biofuel from sugar cane?

• It reduces the cost of production

• It increases the amount of fuel produced

• It speeds up the production process

• It improves the quality of the fuel

What is the percentage yield of ethanol production from sugar cane if the theoretical yield is 560 litres and the actual yield is 484 litres?

• 90%

• 80%

• 75%

• 86%