5. A possible mechanism for the overall reaction is found below: Br2 (g) + 2 NO
ID: 901210 • Letter: 5
Question
5. A possible mechanism for the overall reaction is found below: Br2 (g) + 2 NO (g) 2 NOBr (g) Step 1 (fast) NO (g) + Br2 (g) NOBr2 (g) Step 2 (slow) NOBr2 (g) + NO (g) 2 NOBr (g) Answer following questions:
The rate law based on this mechanism is?
What is molecularity of the first step in the mechanism?
How many intermediates are involved in the mechanism?
Does reaction include catalyst? Explain your answer.
Give the definition for the intermediate.
Give the definition for the molecularity of the elementary step.
Which step is rate determining in this mechanism?
Give the definition for the rate determining step.
Explanation / Answer
Rate law -r= K[ NOBr2][NO]
The slowest step determines the rate of the reaction and this step is the controlling step.
The molecularity of the first reaction is 2 ( since one molecule of NO and 1 molecules of Br2 are participating]
The only one intermediate is [NOBr2]
The reaction is gas phase reaction and any gas phase reaction catalyst is used
Molecularity of an elementary reaction is the number of molecules participating in the reaction
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