Understanding Percent Yield in Chemistry

What is the formula for calculating percent yield?

• Experimental yield divided by theoretical yield times 100

• Theoretical yield divided by experimental yield times 100

• Experimental yield plus theoretical yield

• Theoretical yield minus experimental yield

In the cookie example, if the recipe calls for 24 cookies and you make 20, what is your experimental yield?

• 24 cookies

• 20 cookies

• 44 cookies

• 4 cookies

What is the role of stoichiometry in determining theoretical yield?

• It determines the limiting reactant

• It provides the theoretical yield

• It measures the mass of reactants

• It calculates the experimental yield

In the given problem, what are the reactants used to produce water?

• Hydrogen and nitrogen

• Oxygen and carbon

• Carbon and hydrogen

• Hydrogen and oxygen

What is the mass of one mole of H2O according to the periodic table?

• 22 grams

• 18 grams

• 16 grams

• 20 grams

Which reactant is identified as the limiting reactant in the problem?

• Oxygen

• Carbon

• Hydrogen

• Water

What is the theoretical yield of water when starting with 33 grams of hydrogen?

• 250 grams

• 297 grams

• 338 grams

• 301 grams

If the experimental yield is 250 grams and the theoretical yield is 297 grams, what is the percent yield?

• 84%

• 90%

• 75%

• 100%

Why is it important to identify the limiting reactant in a chemical reaction?

• To determine the excess reactant

• To measure the reaction time

• To calculate the experimental yield

• To find the theoretical yield

What does a percent yield of less than 100% indicate about an experiment?

• The theoretical yield was incorrect

• There was an error or loss in the experiment

• The experiment was perfect

• The experimental yield was too high