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Kinetics of chemical reactions

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By Expert Faculty of Sri Chaitanya
Question

A first order chemical reaction. A ®P is occurring at 500 K. If the same reaction is to be carried out in presence of a catalyst, temperature of 400 K is required to be maintained in order to maintain the same rate of reaction. If the catalyst lowers the activation energy by 30 kJ, then what would be the value of activation energy of the original pathway (uncatalysed reaction)/25.

Moderate
Solution

logunncatalysed =logA-Eac500RT

logkcat=logA-Eauc400RT

Eauc5=Eac4

4Eauc = 5 Eac

Eauc-Eac=30

54EacEac=30

Eac=120 kJ

Eauc=150 kJ

150÷25=6


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