Percent Yield Calculation Quiz

What is the initial mass of phosphorus used in the reaction?

• 117 g

• 714 g

• 1.02 * 10^3 g

• 239.70 g

What does the percent yield compare in a chemical reaction?

• Mass and volume

• Reactants and products

• Temperature and pressure

• Actual yield and theoretical yield

What is the first step in calculating the theoretical yield?

• Balancing the chemical equation

• Measuring the actual yield

• Calculating the molar mass

• Determining the limiting reactant

How many moles of phosphorus are needed to react with bromine in the balanced equation?

• 2 moles

• 3 moles

• 1 mole

• 4 moles

What is the molar mass of phosphorus tribromide (PBr3)?

• 270.67 g/mol

• 123.88 g/mol

• 239.70 g/mol

• 79.9 g/mol

What is the theoretical yield of phosphorus tribromide calculated in the video?

• 239.70 g

• 117 g

• 1.02 * 10^3 g

• 714 g

How is the percent yield calculated?

• Actual yield divided by theoretical yield, multiplied by 100

• Theoretical yield divided by actual yield, multiplied by 100

• Theoretical yield minus actual yield

• Actual yield plus theoretical yield

What was the actual yield of phosphorus tribromide in the experiment?

• 239.70 g

• 714 g

• 117 g

• 1.02 * 10^3 g

What does a percent yield of 70% indicate about the reaction?

• The reaction was 70% efficient

• 70% of the reactants were used

• The reaction produced 70% more product

• The reaction was 70% complete

Why might the actual yield be less than the theoretical yield?

• Incomplete reactions

• Measurement errors

• All of the above

• Side reactions