Question

What is value of percent atom economy if formula weight of product is 46 u and sum of formula weight of all reactants is 92 u?

• A. 35
• B. 50
• C. 40
• D. 45

Hint:

Atom economy is simply a percentage fraction of "what you want" divided by "everything you put in". Since the product weight (46) is exactly half of the total reactant weight (92), it is an instant 50

Answer 1

The Correct Option is B

Step 1: Recall atom economy.
Percent atom economy is the mass of the wanted product divided by the total mass of the reactants, times 100.

Step 2: Put in the values.
\[ \%\,\text{Atom Economy} = \frac{46}{92}\times 100 \]

Step 3: Simplify.
Since 46 is half of 92, the answer is 50 percent.
\[ \boxed{50,\ \text{option 2}} \]