Chemical Kinetics Question 318
Question: The reaction $ A\to B $ follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B-
Options:
A) 2 hours
B) 1 hour
C) 0.5 hour
D) 0.25 hour
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ A\to B $ For a first order reaction Given $ a=0.8mol,( a-x )=0.8-0.6=0.2 $
$ k=\frac{2.303}{1}log\frac{0.8}{0.2}or=2.303,log4 $ again $ a=0.9,a-x=0.9-0.675=0.225 $
$ k=\frac{2.303}{t}\log \frac{0.9}{0.225} $
$ 2.303log4=\frac{2.303}{t}log4 $ Hence t=1 hour
