Stoichiometry Problem Quiz

What is the first step in solving a stoichiometry problem as described in the video?

• Write a balanced chemical equation

• Determine the limiting reagent

• Calculate the percent yield

• Find the theoretical yield

What is the correct chemical formula for sulfur trioxide?

• SO3

• S2O3

• S3O2

• SO2

How many moles of oxygen are required to react with one mole of sulfur according to the balanced equation?

• 10 moles

• 6 moles

• 12 moles

• 8 moles

What is the molar mass of sulfur used in the conversion from grams to moles?

• 32.07 g/mol

• 128.26 g/mol

• 64.14 g/mol

• 256.52 g/mol

Why is oxygen considered the limiting reagent in this reaction?

• There is more sulfur than oxygen

• Oxygen is required in a larger ratio than sulfur

• Sulfur is more reactive than oxygen

• Oxygen is a diatomic molecule

What is the theoretical yield of sulfur trioxide in grams?

• 28.7 grams

• 40.2 grams

• 25.4 grams

• 31.6 grams

How is the percent yield calculated?

• Theoretical yield divided by actual yield times 100%

• Actual yield divided by theoretical yield times 100%

• Actual yield minus theoretical yield

• Theoretical yield plus actual yield

What was the actual yield of sulfur trioxide given in the problem?

• 3.21 grams

• 5.00 grams

• 2.50 grams

• 4.00 grams

What is the percent yield of the reaction?

• 85.3%

• 90.0%

• 80.5%

• 95.42%

What does a high percent yield indicate about the reaction?

• The reaction was inefficient

• The reaction was carried out with precision

• The reactants were not pure

• The reaction was incomplete