Percent Yield

Front

What is percent yield in a chemical reaction?

Back

Percent yield is a measure of the efficiency of a reaction, calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100.

Front

How do you calculate percent yield?

Back

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

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

What is the actual yield?

Back

The actual yield is the amount of product that is actually obtained from a chemical reaction, measured in the lab.

Front

If the theoretical yield of a reaction is 50 grams and the actual yield is 45 grams, what is the percent yield?

Back

Percent yield = (45 g / 50 g) x 100 = 90%.

Front

What factors can affect the percent yield of a reaction?

Back

Factors include incomplete reactions, side reactions, loss of product during recovery, and measurement errors.

Front

In a reaction where the theoretical yield is 100 grams and the actual yield is 80 grams, what is the percent yield?

Back

Percent yield = (80 g / 100 g) x 100 = 80%.

Front

What does a percent yield of over 100% indicate?

Back

A percent yield over 100% typically indicates an error in measurement or calculation, as it is not physically possible to produce more product than the theoretical yield.

Front

How can you improve the percent yield of a reaction?

Back

Improving reaction conditions, optimizing reactant ratios, and minimizing product loss during recovery can help improve percent yield.

Front

What is the significance of a low percent yield in a chemical reaction?

Back

A low percent yield may indicate that the reaction is inefficient, that side reactions are occurring, or that there are issues with the reaction conditions.