5.2b Percent Yield

Front

What is percent yield?

Back

Percent yield is a measure of the efficiency of a chemical reaction, calculated as the ratio of the actual yield to the theoretical yield, expressed as a percentage.

Front

How do you calculate percent yield?

Back

Percent yield = (Actual Yield / Theoretical Yield) x 100%.

Front

What is theoretical yield?

Back

Theoretical yield is the maximum amount of product that can be produced in a chemical reaction under ideal conditions.

Front

What does a percent yield of 100% indicate?

Back

A percent yield of 100% indicates that the actual yield of the product is equal to the theoretical yield, meaning the reaction was perfectly efficient.

Front

If the actual yield is 30 grams and the theoretical yield is 50 grams, what is the percent yield?

Back

Percent yield = (30g / 50g) x 100% = 60%.

Front

What does a low percent yield suggest about a reaction?

Back

A low percent yield suggests that the reaction was not efficient, possibly due to side reactions, incomplete reactions, or loss of product during recovery.

Front

In a reaction, if the theoretical yield is 40 grams and the actual yield is 10 grams, what is the percent yield?

Back

Percent yield = (10g / 40g) x 100% = 25%.

Front

What is the significance of percent yield in laboratory experiments?

Back

Percent yield helps evaluate the efficiency of a reaction and can indicate the need for optimization in experimental procedures.

Front

What factors can affect the percent yield of a reaction?

Back

Factors include reaction conditions (temperature, pressure), purity of reactants, and the presence of side reactions.

Front

If a reaction has a percent yield of 75%, what does this mean?

Back

It means that 75% of the theoretical yield was obtained as the actual yield.