The activation energies of two reactions are given as E_a1=40 J and E_a2= 80 J, then the relation between their rate constants can be written as:

Dear krishna,

The arrhenius equation is K = A exp(-E_a/RT).  A is the pre - exponential factor and depends on reaction .

using this relatipon we can find easily ,

  K₁/k₂ =  (A₁/A₂) *exp((E_a2 - E_a1)/RT)  

putting values , we get ,   

K₁/k₂ =  (A₁/A₂) *exp(40/RT) 

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