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Question

A hydrogenation reaction is carried out at 500 K. If the same reaction is carried out in presence of a catalyst at the same rate, the temperature required is 400 K. Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20 KJmol1.

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Solution

we have
E500=E4004×51alsoE500=E400+202equatingrightsideofbotheqnE400+20=E4004×5(S4=1.25)E400+20=E400×1.251.25E400E400=200.25E400=20E400=200.25=80E400=80KJmolsubstitutethisineqn2E500=E400+20=80+20E500=100KJmol

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