Question

What is the activation energy for a reaction if its
rate doubles when the temperature is raised from
20°C to 35°C ? (R = 8.314 J mol-1 K-1)
[NEET 2013]
(1) 269 kJ mol-1
(2) 34.7 kJ mol-1 a
(3) 15.1 kJ mol-1 (4) 342 kJ mol-1​

Answer 1

HX →H

+

+X

−

weak acid          0         0

1-a                       a         a

a = 20% dissociation

i=(1−a)+a+a=1+a=1+0.2=1.2

ΔT

f

​

=i×K

f

​

×m

=1.2×1.86×0.5

=1.12K