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Overall rate = k[X1][Y2] k = rate constant Assuming step (i) to be reversible, its equilibrium constant, keq = [X]^2/[X2] ⇒ [X]^2 = keq [X2]; [X] = √keq [X2]^(1/2) From eq (1) and (2) Rate = kkeq^(1/2) [X2]^(1/2) [Y2] Overall order = 1/2 + 1/2 + 3/2 = 1.5

1. Overall rate = k[X1][Y2]
2. Rate = kkeq^(1/2) [X2]^(1/2) [Y2]
3. Overall order = 1/2 + 1/2 + 3/2 = 1.5
4. Rate is proportional to [X2]^(1/2).

Correct answer: Overall order = 1/2 + 1/2 + 3/2 = 1.5

Solution

The overall order of the reaction is calculated as the sum of the exponents of the concentration terms in the rate law, which is correctly given as 1.5.

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