Question

The reaction : A $\to$ B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A produce 0.675 mol of B?

• A. 1 hr
• B. 0.5 hr
• C. 0.25 hr
• D. 2 hr

Answer 1

The correct option is A 1 hr

The fraction of A reacted in each case is same
i.e., $\frac{0.6}{0.8}=\frac{3}{4}$ and $\frac{0.675}{0.90}=\frac{3}{4}$
$\therefore$ Time taken is same.