Percent Yield Chemistry

What does percent yield indicate?

• The mass of product that should be obtained

• How quickly the reaction is completed

• The product of product actually obtained

• The efficiency of the chemical reaction

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

• Percent
• actual
• stoichiometry
• theoretical

Which of the following is NOT a reason for the actual yield to be different from the theoretical yield?

• some product is lost in purification

• more excess reactant is added

• competing reactions may use up reactants

• the limiting reactant may not be 100% pure

A chemical reaction was carried out where a yield of 73g was expected, but a yield of 62g was obtained. Calculate the percent yield.

• 85%

• 118%

• 84.9%

• 11%

2Fe₂O₃ + C → Fe + 3CO₂

You add 28.0 grams of carbon. You find the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂?

• 209%

• 15.8%

• 6435%

• 16%

P₄ + 6Cl₂ --> 4PCl₃

The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Calculate percent yield for the reaction.

• 78%

• 64%

• 33%

• 27%