Chemistry - Chemical Kinetics Question with Solution | TestHub

Question Explanation : Find total number of moles of $\mathrm{A},\mathrm{B}\&\mathrm{C}$ at the end of $50\%$ reaction

Concept : Parallel first order reaction

Solution :

1. At $50\%$ reaction, moles of A reacted = $0.5\times 2=1$ mole, and remaining A = $1$ mole.

2. In both parallel paths, $1$ mole of A produces $2$ moles of products (either B or C).

3. Total moles of products (B+C) formed = $2\times (molesofAreacted)=2\times 1=2$ moles.

4. Total moles in the system = moles of remaining A + total moles of products = $1+2=3$ moles.

Final Answer: Option (2)