IIT JEE past question Kinetics 6

The rate constant for the first order decomposition of a dcertain reaction is described by the equation

log_{10} k(s^{-1})=14.3-\frac{1.25\times10^4K}{T}

A) What is the energy of activation for this reaction?
B) At what temperature will its half life period be 256 minutes?

6 Answers

1
skygirl ·

rate = Ae-Ea/RT

lnk = lnA - Ea/RT

=> logk = logA - Ea/2.303RT

comparing the given eqn with the above one...

Ea/2.303R = 1.25E4

=> Ea= 2.303X8.314X1.25E4 J

half life = 256 mins = 256X60 s.

k = 0.693/[256X60]

wen we put this in the above eqn, we get T.

21
tapanmast Vora ·

Are v expecting the same level of tuffness for the questions ???

Sir, pl. reply!!!!!!!

A) 1.25*104 = Ea/2.303R

B) K = ln2 / 256*60

now sub. in given eqtn to get T

24
eureka123 ·

24
eureka123 ·

fir se late......

21
tapanmast Vora ·

hum dono late [2]

62
Lokesh Verma ·

dont worry all pinks :)

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