# The reaction C2H5CN(g) arrow CH2CHCN(g) + H2(g) is first order. In an experiment, the rate...

## Question:

The reaction {eq}C_2H_5CN(g) \to CH_2CHCN(g) + H_2(g) {/eq} is first order. In an experiment, the rate constant is determined to be 0.148 s{eq}^{-1} {/eq} at 726 degrees Celsius.

a. Calculate the half-life of the reaction at 726 degrees Celsius based on this experiment.

b. If the initial partial pressure of {eq}C_2H_5CN {/eq} in a container at 726 degrees Celsius is 2.64 atm, how long will it take to fall to 0.330 atm?

## Rate Law:

The kinetics of a particular chemical reaction are described by a mathematical expression known as its rate law, which has two general forms. The first form is the one containing a certain set of reactant concentration terms, which can be used to compute the instantaneous rate for a particular set of concentration values. The second form is integrated, which allows you to determine how a particular reactant concentration will change over time, relative to a known initial value. It is also used to determine the half-life of the reaction.

## Answer and Explanation: 1

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**Question a)**

{eq}C_2H_5CN(g) \to CH_2CHCN(g) + H_2(g) {/eq}

Assuming that this gas-phase reaction is performed at constant volume and...

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Chapter 19 / Lesson 6In this lesson, we'll talk about first-order reactions like radioactive decay. We'll use the mathematical descriptions of these reactions to discuss their behavior.