Question

What is the percentage atom economy when formula weight of product obtained is 70 u and the sum of formula weight of reactant is 140 u ?

• A. 30%
• B. 35%
• C. 50%
• D. 75%

Answer 1

Answer: (C)

50%

Answer 2

Atom Economy = $\dfrac{\text{Formula Weight of Desired Product}}{\text{Sum of Formula Weights of Reactants}} \times 100$

Substitute values:

$$\text{Atom Economy} = \dfrac{70}{140} \times 100 = 50\%$$