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Interpretation of Arrhenius Equation

Arrhenius equation represents the dependence of the rate constant k of a reaction on the absolute temperature T:
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where the factor Description: 34940.png refers to the fraction of collisions (also effective collisions) that have the sufficient activation energy to collide and form products and A is the number of effective collision per unit time. Therefore, the product of A and Description: 34948.png is the number of collisions that actually lead to the formation of products.

Determination of activation energy

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where k1 and k2 are rate constants at temperatures T1 and T2 kelvin, respectively. Knowing these values, Ea can be calculated. Care must be taken to insert the value of R in a unit in which Ea is desired.

Main characteristics of arrhenius equation

  • The larger the activation energy of a reaction, the smaller is the value of rate constant.
  • The larger the activation energy of a reaction, the greater is the influence of change in temperature on rate constant.
  • For lower temperature range, increase in temperature causes more change in the value of k than the same increase in temperature of high temperature range.

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