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KCET2016ChemistryChemical Kinetics

The activation energy of a chemical reaction can be determined by,

Options

  1. Aevaluating rate constants at two different temperatures.
  2. BO changing the concentration of reactants.
  3. Cevaluating the concentration of reactants at two different temperatures.
  4. Devaluating rate constant at standard temperature,

Correct answer

A. evaluating rate constants at two different temperatures.

Step-by-step solution

Activation energy of a chemical reaction can be determined by measuring the values of rate constant at two differenttemperatures Let ( k₁ ) and ( k₂ ) are the rate constant for the reaction at two different temperature, that is, ( T₁ ) and ( T₂ ) respectively. ( k₁= A- E_ a 2.303 R T₁ (1) ) ( k₂= A- E_ a 2.303 R T₂ (2) ) Subtract Eq. (1) from Eq. (2), we get [ array l k₂- k₁= E_ a 2.303 R [ 1 T₁ - 1 T₂ ] k₂ k₁ = E_ a 2.303 R [ 1 T₁ - 1 T₂ ] k₂ k₁ = E_ a 2.303 R [ T₂-T₁ T₁ T₂ ] E_ a =2.303 R k₂ k₁ [ T₁ T₂ T₂-T₁ ] ar

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