The tabulated data were collected for this reaction: CH3Cl(g) + 3Cl2(g) → CCl4(g) + 3HCl(g)

[CH3Cl] (M) [Cl2] (M) Initial Rate (M/s)

0.050 0.050 0.014

0.100 0.050 0.029

0.100 0.100 0.041

0.200 0.200 0.115

(a) Write an expression for the reaction rate law and calculate the value of the rate constant, k.

(b) What is the overall order of the reaction?

ai) Rate law,  

aii) Rate constant, k = 1.25

b) Overall order of reaction = 1.5

Explanation:

Equation of Reaction:

If , the rate of backward reaction is given by:  

k is constant for all the stages

Using the information provided in lines 1 and 2 of the table:

Using the information provided in lines 3 and 4 of the table and insering the value of a:

The rate law is:

The rate constant then becomes:

b) Overall order of reaction =  a + b

Overall order of reaction = 1 + 0.5

Overall order of reaction = 1.5