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4HBr+O(2)to2H(2)O+2Br(2). The moleculari...

`4HBr+O_(2)to2H_(2)O+2Br_(2)`. The molecularity of the reaction appears as 5, but experimentally, it is 2.
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The mechanism of oxidation reaction of HBr is given in three steps.
`HBr+O_(2) to HOOBr, HOOBr+HBr to 2HOBr HOBr+HBr to H_(2)O+Br_(2)`
Molecularity of each step is `2`.
The overall molecularity of the slowest step `(1st)` is `2`
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