RPAL Percent Yield 2

Question 1

A reaction has a theoretical yield of 25 g and a percent yield of 72%. What is the actual yield?

Accepted Answer

18 g

Answer

34.7 g

Answer

72 g

Answer

25 g

Question 2

What does a percent yield of 95% tell a chemist?

Accepted Answer

5% of the expected product was lost or not formed

Answer

The reaction was 5% complete

Answer

95% of reactants were left over

Answer

The limiting reagent was 95% consumed

Question 3

If 3.6 g of product is collected from a reaction with a theoretical yield of 4.0 g, what is the percent yield?

Accepted Answer

90%

Answer

80%

Answer

111%

Answer

36%

Question 4

In industrial chemistry, why is maximizing percent yield important?

Accepted Answer

It reduces waste and lowers production costs per unit of product

Answer

It increases the boiling point of the product

Answer

It decreases the activation energy of the reaction

Answer

It eliminates the need for a limiting reagent

Question 5

What is the theoretical yield if the actual yield is 12 g and the percent yield is 60%?

Accepted Answer

20 g

Answer

7.2 g

Answer

72 g

Answer

0.05 g

Question 6

Two students run the same reaction. Student A gets 85% yield; Student B gets 91% yield. What does this suggest?

Accepted Answer

Student B had less product loss or better technique

Answer

Student B started with more limiting reagent

Answer

Student A used a different balanced equation

Answer

Student B's theoretical yield was lower