% Atom Economy & % Yield

What is the % atom economy for the formation of ethane in the reaction above?

• 100

• 30

• 28

• 60

Given the reaction:

CaCO₃ → CaO + CO₂

RAM: Ca = 40, C = 12, O = 16

Use the RAMs above to calculate the % atom economy for the formation of calcium oxide.

• 56

• 40

• 44

• 100

Given the reaction

2KClO₃ → 2KCl + 3O₂

Masses: O = 16, K = 39, Cl = 35

Calculate the % atom economy for the formation of potassium chloride.

• 22.4

• 96

• 30

• 60.7

Theoretical yield = 73g

Actual yield =62g

Calculate the percentage yield.

• 1.16%

• 116%

• 85%

• 76%

Al(OH)3 + 3HCl --> 3H2O + AlCl3

14g of alumimium hydroxide completely reacted with excess hydrochloric acid.  If only 22g of aluminium chloride is produced, calculate the percentage yield.

• 100%

• 92%

• 69%

• 25%

Al(OH)₃ + 3HCl --> AlCl₃ + 3H₂O

GFM Al(OH)₃ = 78

GFM AlCl₃ =133.5

7.8g of alumimium hydroxide completely reacted with excess hydrochloric acid. If only 15g of aluminium chloride is produced, calculate the percentage yield.

• 100%

• 89%

• 69%

• 25%