Ethyl iodide (C2H5I) decomposes at a certain temperature in the gas phase as follows: C2H5I(g) → C2H4(g) + HI(g) From the following data determine the order of the reaction and the rate constant. Time (min) [C2H5I] (M) 0.0 2.00 15.0 1.73 30.0 1.46 48.0 1.14 75.0 0.65

The order of the reaction is zero and the rate constant 0.018 M/s.

Explanation:

The order of the reaction be = x

The rate law of the reaction ;

1. Rate of the reaction  when concentration changes from 2.00 M to 1.73 M in interval of 0.0 minutes to 15.0 minutes.

..[1]

2. Rate of the reaction  when concentration changes from 2.00 M to 1.73 M in interval of 15.0 minutes to 30.0 minutes.

...[2]

[1] ÷ [2]

x = 0

The order of the reaction 0.

The rate law of the reaction ;

The order of the reaction is zero and the rate constant 0.018 M/s.