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SOHAN SARANGI Grade: 12
        

The activation energy of a certain uncatalysed reaction at 300K is 76 kJ/mol.The activation energy is lowered by 19 kJ/mol by the use of catalyst. By what factor, the rate of catalysed reaction is lowered?

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

K = Ae-E/RT                                      (E is activation energy)


rate(R)= K(a)n                     (k=rate constant & a is concentration  , n is order of reaction)                  


rate directily proportional to rate constant so


 


R1/R2 = K1/K2 = e[-E1+E2]/RT           


            =e[-76+19]/RT 


R1/R2 = e-2.28                                       (e = 2.8 approx)


R2 = 8R1              


 

6 years ago
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