The decomposition of 1,3-butadiene represents a second order process. 2 1,3-buta
ID: 508639 • Letter: T
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.
a. The initial concentration of 1,3-butadiene is 2.580×10-3 M, however after 3.61 h the concentration decreases to 1.032×10-3 M. Calculate the rate constant (in /M hr) for this process.
b) If the initial concentration of 1,3-butadiene is 2.580×10-3 M, calculate the concentration (in M) of 1,3-butadiene after 1.84 hrs.
Explanation / Answer
a)
initial concentration = 2.580 x 10^-3 M
remaining concentration = 1.032 x10^-3 M
time = 3.61 h
for second order reaction :
rate constant k = 1/t [1/At - 1/ Ao]
= 1/3.61 [1/1.032 x 10^-3 - 1/ 2.580 x 10^-3]
rate constant k = 161 / M hr
b)
initial concentration = 2.580 x 10^-3 M
time = 1.84 h
for second order reaction :
rate constant k = 1/t [1/At - 1/ Ao]
161 = 1/1.84 [1/At - 1/ 2.580x 10^-3]
At = 1.462 x 10^-3 M
concentration after = 1.462 x 10^-3 M
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