1. For the reaction given below 2NO 2 (g) + F 2 (g) 2NO 2 F(g) The units of k we
ID: 1075084 • Letter: 1
Question
1. For the reaction given below
2NO2(g) + F2(g) 2NO2F(g)
The units of k were determined experimentally to be M-1s-1, which indicate a second-order reaction overall.
(a)If the reaction is first order with respect to F2, what must be the reaction order with respect to NO2?
(b)Write out the rate law for the reaction.
(c)Is the reaction as written above an elementary reaction (an elementary step)? That is, does the reaction proceed exactly as written, in one step? Why or why not?
(d)If a reaction mechanism is proposed for this reaction, what should be the rate law for the ratedetermining elementary step of the reaction mechanism
(e)Suggest at least three ways for increasing the rate of this reaction at constant temperature.
Explanation / Answer
Ans
a) Sinc ethe reaction is first order with respect to F2 , the reaction order with respect to NO2 will be 2 - 1 = 1
b) The rate law of the reaction is given as :
Rate = k[F2] [NO2]
c) The reaction written above is not the elementary reaction as shown. The reaction possibly has more than 1 steps, as the order of the reaction is 2 , but according to the reaction shown ( if elementary), the order of the reaction will be 3.
d) The rate law of the reaction is same as the rate law of the rate determining step of the reaction.
It will be given as :
Rate = k[F2] [NO2]
e) To increase the rate of reaction we can :
1. Add catalyst
2. Increase pressure
3. Add reactants ( NO2 or F2) or remove products ( NO2F) from the reaction mixture.
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