RPAL Percent Yield

Question 1

What is percent yield?

Accepted Answer

The ratio of actual yield to theoretical yield expressed as a percentage

Answer

The ratio of limiting reagent to excess reagent

Answer

The percentage of reactants converted to products at equilibrium

Answer

The fraction of product lost during the reaction

Question 2

What is the formula for percent yield?

Accepted Answer

(Actual yield ÷ Theoretical yield) × 100%

Answer

(Theoretical yield ÷ Actual yield) × 100%

Answer

(Actual yield − Theoretical yield) × 100%

Answer

(Theoretical yield + Actual yield) ÷ 2

Question 3

If the theoretical yield is 50 g and the actual yield is 40 g, what is the percent yield?

Accepted Answer

80%

Answer

125%

Answer

90%

Answer

40%

Question 4

Why is percent yield almost always less than 100%?

Accepted Answer

Because of side reactions, product loss during purification, and incomplete reactions

Answer

Because theoretical yield is always overestimated

Answer

Because the limiting reagent is never fully identified correctly

Answer

Because Avogadro's number introduces rounding errors

Question 5

A percent yield greater than 100% indicates what?

Accepted Answer

An error — possibly impure product or incorrect theoretical yield calculation

Answer

An exceptionally efficient reaction

Answer

The reaction produced extra atoms from the environment

Answer

The actual yield was calculated incorrectly and is actually valid

Question 6

Which of the following would increase the percent yield of a reaction?

Accepted Answer

Reducing product loss during collection and purification

Answer

Adding more excess reagent

Answer

Increasing the temperature of the reaction

Answer

Using a larger container