(a) A first order reaction is complete in 30 minutes at and in 10 minutes at . Calculate activation energy for the reaction.
(b) Write the two conditions for collisions to be effective collisions.
(c) How order of reaction and molecularity differ towards a complex reaction ?
[Given : ]
a) k = 0.693/ t1/2
k1= 0.693/ t1/2= 0.693 / 30
k2= 0.693/ t1/2= 0.693 / 10
log k2/k1 = Ea /2.303 R (1/ T1 -1/ T2)
log 3 = Ea /2.303 x 8.314 (1/ 300 -1/ 320)
Ea = 43.8 kJ/mol
b) Conditions for collisions to be effective collisions
1. Proper orientation and
2. Energy of the colliding particles should be more than threshold energy
c) For a complex reaction, order of reaction is applicable while molecularity has no meaning.