8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Percent Yield from Reaction Data 4 questions
Percent Yield from Reaction Data
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
Percent yield is (actual yield ÷ theoretical yield) × 100 percent. Actual yield is the mass of product collected.
Question 1
A reaction’s theoretical product mass is 20.0 g, and 15.0 g is collected. What is the percent yield?
- 25.0 percent
- 66.7 percent
- 75.0 percent
- 133 percent
Question 2
A reaction has a theoretical yield of 12.0 g and a percent yield of 80.0 percent. Calculate the actual yield.
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Question 3
Explain how some product can be formed and the measured percent yield can still be below 100 percent.
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Question 4
What establishes the theoretical yield in a calculation?
- The mass of the empty product container
- The largest amount of product predicted from the starting amounts and balanced equation
- The mass of product spilled during collection
- The mass of water used to wash the equipment
Comparing Product Recoveries 4 questions
Comparing Product Recoveries
Use the information below to answer the questions.
A class compares three model runs that produce the same compound. Theoretical yields come from each run’s starting amounts. Actual yields are the measured dry product masses.
| Run | Theoretical yield (g) | Actual yield (g) |
|---|---|---|
| P | 10.0 | 8.0 |
| Q | 20.0 | 14.0 |
| R | 15.0 | 13.5 |
Question 5
Which run has the highest percent yield?
- P
- Q
- R
- All three are equal.
Question 6
Calculate the percent yield in run P and show your setup.
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Question 7
Which run has the greatest difference between theoretical and actual yield in grams?
- P
- Q
- R
- All have the same difference.
Question 8
A fourth run is reported above 100 percent. Explain one measurement issue that could lead to that result.
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