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What is activation energy ?...

What is activation energy ?

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A reaction is carried out at 600 K . If the same reaction is carried out in the presence of catalyst at the same rate and same frequency factor, the temperature required is 500 K . What is the activation energy of the reaction, if the catalyst lowers the activation energy barrier by 20 KJ//mol ?

What is the activation energy for the reverse of this reaction? N_2O_(4(g)) to 2NO_(2(g)) Data for the given reaction is Delta H = 54 KJ/mol and epsilon_a =57.2 KJ.