1. Tardigrade
  2. Question
  3. Chemistry
  4. The rate constant of a reaction at 27° C is 2.3 × 10-3 min -1 and at this temperature 0.001 % of reactant molecules are able to cross the energy barrier existing between the reactants and the products. What is the maximum value of rate constant that can be achieved on raising the temperature?

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Q. The rate constant of a reaction at 27∘C is 2.3×10−3min−1 and at this temperature 0.001% of reactant molecules are able to cross the energy barrier existing between the reactants and the products. What is the maximum value of rate constant that can be achieved on raising the temperature?

Chemical Kinetics

Solution:

From Arrhenius equation

logK=logA−Ea2.303RT

Maximum value of K=A

So, 'A' is maximum rate constant

e−Ea/RT= Fraction of molecules crossing energy barrier

=0.001%=10−5

K=2.3×10−3min−1

K=Ae−Ea/RT

2.3×10−3min−1=A×10−5

2.3×102min−1=A

230min−1=A