The first-order decomposition of cyclopropane has a rate constant of 6.7 x 10-4
ID: 1030791 • Letter: T
Question
The first-order decomposition of cyclopropane has a rate constant of 6.7 x 10-4 s-1. If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s? The first-order decomposition of cyclopropane has a rate constant of 6.7 x 10-4 s-1. If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s? The first-order decomposition of cyclopropane has a rate constant of 6.7 x 10-4 s-1. If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s?Explanation / Answer
for first order reaction
K = (2.303 /t) log [A0] / [A]
[A0] = 1.33 M , [A] = ?
t = 644 s
6.7 x 10-4 = (2.303 / 644) log [1.33] / [A]
0.187 = 0.124 - log [A]
log [A] = - 0.063
[A] = 0.86 M
final concentration = 0.86 M