The decomposition of 1,3-butadiene represents a second order process. 2 1,3-buta

Question

The decomposition of 1,3-butadiene represents a second order process.

2 1,3-butadiene 4-Vinylcyclohexene Answer the following questions about the decomposition of 1,3-butadiene.

Report all answers to three significant figures.

1. The initial concentration of 1,3-butadiene is 3.553×10-1 M, however after 3.48 h the concentration decreases to 1.101×10-1 M. Calculate the rate constant (in /M hr) for this process.

2. If the initial concentration of 1,3-butadiene is 3.553×10-1 M, calculate the concentration (in M) of 1,3-butadiene after 2.73 hrs.

Explanation / Answer

for second order kinetics,

Rate constant K = 1/t ( 1/[A]t - 1/[A]0)

K = 1/3.48 *(((1/(1.101*10^-1)) - ((1/(3.553*10^-1)))

K = 1.8012

K = 1/t ( 1/[A]t - 1/[A]0)

1/[A]t = 1/[A]0 + Kt

1/[A]t = (1/(3.553 *10^-1)) + (1.8012 * 2.73)

[A]t = 0.129 M

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