Rate law for an overall reaction?

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d_remeday86

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Consider the following mechanism:

Step 1: X + Y2 ---> XY2 (slow) (k1)

Step 2: XY2 ---> XY + Y (fast) (k2)

Overall: X + Y2 ---> XY + Y


Use the above mechanism to propose a rate law for the overall reaction.
--The answer is:
rate = k1 [X][Y2]

I dont know how they got that answer??? Please explain.

Also, the molecularity of the rate-determining step is bimolecular (molecularity of 2) and the intermediates of this reaction is XY2 only. But can you please explain why it is so. I really want to understand this problem so pleasee help. THANKS IN ADVANCEE!
 
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