RPAL Theoretical Yield 2

Question 1

What assumption underlies the theoretical yield calculation?

Accepted Answer

The reaction proceeds to completion with 100% conversion of limiting reagent to product

Answer

Some limiting reagent always remains unreacted

Answer

The reaction temperature affects the amount of product

Answer

The excess reagent contributes equally to product formation

Question 2

In 2C + O₂ → 2CO, if 4 mol C and 1 mol O₂ react, what is the theoretical yield of CO?

Accepted Answer

2 mol CO

Answer

4 mol CO

Answer

1 mol CO

Answer

3 mol CO

Question 3

A student calculates a theoretical yield of 8.5 g for a product with a molar mass of 17 g/mol. How many moles of product does this represent?

Accepted Answer

0.5 mol

Answer

5.0 mol

Answer

144.5 mol

Answer

0.05 mol

Question 4

Which of the following would NOT change the theoretical yield?

Accepted Answer

Adding more excess reagent

Answer

Adding more limiting reagent

Answer

Changing the stoichiometry of the balanced equation

Answer

Changing the identity of the product

Question 5

For CaCO₃ → CaO + CO₂, if 100 g of CaCO₃ (molar mass = 100 g/mol) reacts completely, what is the theoretical yield of CO₂ (molar mass = 44 g/mol)?

Accepted Answer

44 g

Answer

100 g

Answer

56 g

Answer

22 g

Question 6

Why is the theoretical yield considered an 'ideal' value?

Accepted Answer

Because it assumes perfect conditions with no product lost to side reactions or handling

Answer

Because it is calculated using ideal gas conditions

Answer

Because only ideal solutions can achieve this yield

Answer

Because it is always larger than the limiting reagent mass