RPAL Theoretical Yield

Question 1

What is theoretical yield?

Accepted Answer

The maximum amount of product that can be formed from the limiting reagent

Answer

The actual amount of product collected in the lab

Answer

The amount of excess reagent that remains

Answer

The minimum amount of product that can form

Question 2

Which reagent is used to calculate theoretical yield?

Accepted Answer

The limiting reagent

Answer

The excess reagent

Answer

The largest reactant by mass

Answer

The product itself

Question 3

In the reaction 2H₂ + O₂ → 2H₂O, if O₂ is the limiting reagent with 2 mol, what is the theoretical yield of H₂O?

Accepted Answer

4 mol H₂O

Answer

2 mol H₂O

Answer

1 mol H₂O

Answer

3 mol H₂O

Question 4

What conversion is needed to express theoretical yield in grams?

Accepted Answer

Multiply moles of product by its molar mass

Answer

Divide moles of product by its molar mass

Answer

Multiply moles of limiting reagent by Avogadro's number

Answer

Add molar masses of all reactants

Question 5

If the theoretical yield of a reaction is 50 g but only 40 g is collected, what does this indicate?

Accepted Answer

The reaction was less than 100% efficient — some product was lost

Answer

The theoretical yield calculation was wrong

Answer

The limiting reagent was not fully consumed

Answer

The reaction produced more than expected

Question 6

For N₂ + 3H₂ → 2NH₃, if H₂ is limiting at 6 mol, what is the theoretical yield of NH₃?

Accepted Answer

4 mol

Answer

6 mol

Answer

2 mol

Answer

3 mol