Q.

The rate constant of a reaction at 200K is 10 times less than the rate constant at 400K what is the activation energy Ea of the reaction (R = gas constant)

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a

921.2 R

b

460.6 R

c

230.3 R

d

1842.4 R

answer is B.

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Detailed Solution

log  K2K1=εa2.303R1T1-1T2

T1=200  T2=400

K1= 110K2      K2

log K2110K2= Ea2.303R1200-1400

log 10  = Ea2.303R  200200 × 400

E a = 2.303  ×  400  R

= 921.2 R

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