Question

The following mechanism has been proposed for the gas phase reaction of nitrogen monoxide with bromine.

• step 1:   NO + Br_2--->NOBr₂
  
  step 2:   NOBr₂ + NO --->2 NOBr

(a) Identify the molecularity of each step in the mechanism.

• step 1     _________ (unimolecular, bimolecular, termolecular)
  
  step 2     _________ (unimolecular, bimolecular, termolecular)

(b) Write the equation for the net reaction. Use the smallest integer coefficients possible.

(c) Identify any intemediates and/or catalysts in this mechanism.

Catalyst: Enter formula. If none, leave box blank:

Intermediate: Enter formula. If none, leave box blank:

Answer 1

(a) molecularity of each elementary chemical step of a reaction is the number of reacting species taking part simultaneously in a collision leading to that step.    step-1; bimolecular (2 reactants)

step-2; bimolecular (2 reactants)

(b) equation fot the net reaction is given by

2NO(g)+Br2(g)2NOBr(g)

(c) intermediate is [NOBr2]