MHT CET · Chemistry · Some Basic Concepts of Chemistry

Which from following formulae is a correct formula to determine percent atom economy?

A \(\%\) Atom economy \(=\) Formula weight of product \(\times 100\)
B \(\%\) Atom economy \(=\) Sum of formula weight of all reactant \(\times 100\)
C \(\%\) Atom economy \(=\frac{\text { Formula weight of desired product }}{\text { Sum of formula weight of allreactant }} \times 100\)
D \(\%\) Atom economy \(=\frac{\text { Sum of formula weight of all reactant }}{\text { Formula weight of desired product }} \times 100\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\%\) Atom economy \(=\frac{\text { Formula weight of desired product }}{\text { Sum of formula weight of allreactant }} \times 100\)

Step-by-step Solution

Detailed explanation

Atom economy is the conversion efficiency of a chemical process in terms of all atoms involved and the desired products produced.
\(
\% \text { Atom economy }=\) \(\frac{\text { Formula weight of desired product }}{\text { Sum of formula weight of allreactant }} \times 100
\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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