The initial rates listed in the table were determined for thethermal decompositi

Question

The initial rates listed in the table were determined for thethermal decomposition of azomethane(CH3N=NCH3)

               CH3N=NCH3(g) ---->C2H6(g) + N2 (g)

Experiment          Initial[CH3N=NCH3]           Initial Rate of Decomposition ofCH3N=NCH3 (m/s)
1                            2.4 x 10 -2                               6.0 x10-6                 
2                            8.0 x 10-3                                2.0 x 10-6

a) What is the rate law
b) What is the value of the rate constant ?
c) What is the initial rate of decomposition when the initialconcentration of azomethane is 0.020 M?

Explanation / Answer

The rate law will look like this r = k[CH3N=NCH3]a To find the values of k and a, use the two sets of data 6.0 x 10-6 = k( 2.4 x 10 -2)a 2.0 x 10-6 = k( 8.0 x 10-3)a Now use algebra to solve for k and a (a) You can answer this once you find k and a (b) rate constant is k (c) Find r for [CH3N=NCH3] = 0.020 M

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