Chemical Kinetics - Result Question 1

####1. The rate constant for a first order reaction is 4.606×10−3s−1. The time required to reduce 2.0 g of the reactant to 0.2g is :

(a) 200s

(b) 500s

(c) 1000s

(d) 100s

[2020]

Show Answer

Solution:

  1. (b) First order rate equation is

k=2.303tlog⁡[A0][A]

⇒4.606×10−3=2.303tlog⁡20.2

⇒t=2.3034.606×10−3×log⁡10=1032=500sec

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