Chemical Kinetics Question 320
Question: For a first order reaction $ A\to B $ the reaction rate at reactant concentration of 0.01 M is found to be $ 2.0\times {10^{-5}}mol{L^{-1}}{s^{-1}} $ . The half-life period of the reaction is
Options:
A) 30 s
B) 220 s
C) 300 s
D) 347 s
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Given $ [ A ]=0.01M $ Rate $ =2.0\times {10^{-5}}mol{L^{-1}}{s^{-1}} $ For a first order reaction Rate $ =k[ A ] $
$ k=\frac{2.0\times {10^{-5}}}{[0.01]}=2\times {10^{-3}} $
$ {t_{1/2}}=\frac{0.693}{2\times {10^{-3}}}=347\sec $
