Percent Yield

Front

What is percent yield?

Back

Percent yield is a measure of the efficiency of a reaction, calculated as (actual yield / theoretical yield) x 100%.

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 could be formed from a given amount of reactants, based on stoichiometric calculations.

Front

What is actual yield?

Back

Actual yield is the amount of product that is actually obtained from a chemical reaction.

Front

If the theoretical yield is 50g and the actual yield is 45g, what is the percent yield?

Back

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

Front

Which reaction has a higher percent yield: 30g theoretical yield with 27g actual yield or 50g theoretical yield with 40g actual yield?

Back

30g theoretical yield with 27g actual yield has a percent yield of 90%, while 50g theoretical yield with 40g actual yield has a percent yield of 80%. Therefore, the first reaction has a higher percent yield.

Front

What does a percent yield of over 100% indicate?

Back

A percent yield over 100% indicates that there may have been an error in measurement or calculation, or that impurities were present in the product.

Front

What is the significance of a low percent yield?

Back

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

Front

In the reaction P4 + 6Cl2 → 4PCl3, if 75g of P4 produces 110g of PCl3, how do you find the theoretical yield?

Back

To find the theoretical yield, you must first determine the molar masses and use stoichiometry based on the balanced equation.

Front

What is the percent yield if the theoretical yield is 73g and the actual yield is 62g?

Back

Percent yield = (62g / 73g) x 100% = 84.93%, approximately 85%.