Percent Yield

2Fe₂O₃  +  C  →  Fe  +  3CO₂
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂? (Hint: calculate theoretical yield of CO₂ first)

• 15.8%

• 209.2%

• 6435%

• 15.5

Tags

NGSS.HS-PS1-7

Your percent yield is 80%. The actual amount of product produced was 29.1 grams. What is the theoretical yield?

• 25.2 grams

• 37.3 grams

• 37.1 grams

• 36.3 grams

Tags

NGSS.HS-PS1-7

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%

• 0.82%

• 10.1 %

• 100%

Tags

NGSS.HS-PS1-7

In the balanced reaction below, 9.8 g of benzene, C₆H_6, reacts with excess HNO₃ resulting in 1.0 g of H₂O. What is the percentage yield?

Molar mass (g/mol): C₆H₆ = 78 HNO₃= 63 C₆H₅NO₂= 123 H₂O = 18

C₆H₆ + HNO₃ → C₆H₅NO₂ + H₂O

• 22%

• 44%

• 12%

• 85%

Tags

NGSS.HS-PS1-7

In a chemical reaction, the theoretical yield is 50 grams, but the actual yield is 40 grams. What is the percent yield?

• 80%

• 75%

• 85%

• 90%

When reacting Na with Cl₂, the theoretical yield of NaCl is 13.0 grams. The actual yield was 12.5 grams. What is the percent yield?

• 90.4%

• 104%

• 96.1%

• -3.9%

Answer explanation

Tags

NGSS.HS-PS1-7

Which of the following reactions has the lowest percent yield?

• Predicted yield 25.7g, actual yield 23.2g

• Predicted yield 18.2g; actual yield 15.6g

• Predicted yield 42.1g; actual yield 39.9g

• Predicted yield 93.4g; actual yield 102.3g

What does percent yield indicate?

• The amount of product predicted

• The efficiency of the reaction

• The amount of product actually obtained

• Which reactant runs out first

Answer explanation

% Yield tells the efficiency of your work - how close you were to the theoretical value you should have gotten

Tags

NGSS.HS-PS1-7

• 80%

• 90%

• 95%

• 100%

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

When reacting Na with Cl₂, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?

• 100%

• 104%

• 96%

• 1.04

Tags

NGSS.HS-PS1-7