Chemical Kinetics and Nuclear ChemistryHard

Question

Mechanism of a hypothetical reaction
X2 + Y2 → 2XY is given below :
(i) X2 → X + X(fast)
(ii) X + Y2 ⇌ XY + Y (slow)
(iii) X + Y → XY (fast)
The overall order of the reaction will be :

Options

A.

2

B.

0

C.

1.5

D.

1

Solution

According to law of mass action
r = K[X][Y2]               ....(1)
From fast step-1
Keq = [X]2[X2]
[X] = Keq . [X2]
[X] = Keq[X2]1/2    .....(2)
m equation (1) & (2)
r = Keq.[X2]1/2 [Y2]
r = K'[X2]1/2[Y2].
Overall order of reaction = 1 + 0.5 = 1.5
      Option (3)

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