The following questions refer to the gas-phase decomposition of ethylene chloride. Experiment shows that the decomposition is first order. The following data show kinetics information for this reaction: Time (s): 1.0, 2.0ln [C₂H₅Cl] (M): -1.625, -1.735 What was the initial concentration of the ethylene chloride?

Answer : The initial concentration of the ethylene chloride is, 0.219 M

Explanation :

First we have to calculate the rate constant.

The expression used for first order kinetics is:

Given:

= final time = 2.0 s

= initial  time = 1.0 s

= initial concentration = -1.625 M

= final concentration = -1.735 M

Now put all the given values in the above expression, we get:

The value of rate constant is, 0.11 s⁻¹

Now we have to calculate the initial concentration of the ethylene chloride.

At t = 1, = -1.625 M

At t = 0, = ?

Thus, the initial concentration of the ethylene chloride is, 0.219 M

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