Percent Yield Practice

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 theoretical yield?

Back

Theoretical yield is calculated based on stoichiometry from the balanced chemical equation and the amount of limiting reactant.

Front

What is the formula for calculating percent yield?

Back

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

Front

If the theoretical yield of a reaction is 100g and the actual yield is 80g, what is the percent yield?

Back

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

Front

What does a percent yield of over 100% indicate?

Back

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

Front

What is the significance of a low percent yield?

Back

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

Front

In the reaction P4 + 6Cl2 → 4PCl3, if 75.0g of P4 is used, how do you find the theoretical yield of PCl3?

Back

First, determine the moles of P4, then use the stoichiometry of the balanced equation to find the moles of PCl3 produced, and finally convert to grams.

Front

What is the actual yield in a chemical reaction?

Back

The actual yield is the amount of product obtained from a reaction, measured after the reaction has occurred.

Front

In the reaction CH4 + 2O2 → CO2 + 2H2O, what is the theoretical yield of CO2 from 24g of CH4?

Back

Theoretical yield of CO2 is calculated by converting grams of CH4 to moles, using stoichiometry to find moles of CO2, and converting back to grams.

Front

If the theoretical yield of CO2 is 66 grams and the actual yield is 50 grams, what is the percent yield?

Back

Percent Yield = (50g / 66g) x 100% = 75.76%.