Chemical Kinetics - Result Question 61

####61. The rate of first order reaction is 0.04molL1s1 at 10min and 0.03molL1s1 at 20min after initiation. Find the half-life of the reaction.

(2001, 5M)

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Answer:

Correct Answer: 61. (3.26×102min1)

Solution:

R=k[A] R1=k[A]1 and R2=k[A]2 R1R2=43=[A]1[A]2  Also k(t2t1)=ln[A]1[A]2=ln43 ln2t1/2×10=ln43 t1/2=10log3log4log3=30.60.48=25min



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