NEET Chemistry Chemical Kinetics Questions Solved

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For the reaction

2NO(g) + Cl(g) 2NOCl(g)

the following data were collected. All the measurements were taken at 263 K :

Experiment No.            Initial                Initial               Initial rate of disapppearance of Cl2(M/min)

                                [NO] (M)          [Cl2] (M) 

     1                           0.15                 0.15                      0.60

     2                           0.15                 0.30                      1.20

     3                           0.30                 0.15                      2.40

     4                           0.25                 0.25                         ?

(a) Write nthe expression for rate law.

(b) Calculate the value of rate constant and specify its units.

(c) What is the initial rate of disappearance of  Cl2 in exp. 4?

(a) Rate law = K[NO]2  [Cl2

(b) 0.60 M min-1 = K[0.15]2 [0.15] M3

     K = 177.7 M-2 min-1

(c) Initial rate of disapperance of  Cl2 in exp. 4 

      Initial rate = 177.7 M-2 min-1 ×(0.25)×(0.25) M3

                         = 2.8 M min-1

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