Question

1. A)Determine the rate law of the reaction and find the value of the rate constant...

1.

A)Determine the rate law of the reaction and find the value of the rate constant (k) with proper units.
   2O3 → 3O2
Experiment #    Initial [O3] (M)    Initial Rate (M/sec)
1 0.2            4
2 0.4            8
3 0.6            12


B) Find out the rate constant K data for a method of initial rates problem with three experimental rates determined.
[A]          [B]            rate
Experiment 1       1M           .1M 2 x 10-4
Experiment 2       2M            .1M 4 x 10-4
Experiment 3       2M           .2M           4 x 10-4

Science   Chemistry   
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Answer #1

This table shows that after doubling the initial concentration of O3, rate is getting doubled. Therefore, the rate is first order in terms of concentration of O3.

Rate = K [O3]

4 M/Sec = K (0.2)M

K = 4/0.2 Sec-1= 40/2 Sec-1= 20 Sec-1

B) This table shows that after doubling the initial concentration of A, rate is getting doubled while doubling the concentrations of both the A and B, rate is doubled. This observation indicates that the reaction is first order in terms of concentration of A and zero order in terms of concentration of B. Thus the rate law can be represented as:

Rate = K [A]1 [B]0

2 x 10-4 = K x 1

K = 2 x 10-4 Sec-1

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