A) The rearrangement of cyclopropane to propene at 500 ½C (CH2)3 N2O(g) + H2O(l)

Question

A) The rearrangement of cyclopropane to propene at 500 ½C (CH2)3 N2O(g) + H2O(l) is first order in NH2NO2. During one experiment it was found that when the initial concentration of NH2NO2 was 0.850 M, the concentration of NH2NO2 dropped to 0.211 M after 21975 s had passed. Based on this experiment, the rate constant for the reaction is______________ s-1. CH3CH=CH2 is first order in (CH2)3 with a rate constant of 6.70E-4 s-1. If the initial concentration of (CH2)3 is 0.183 M, the concentration of (CH2)3 will be _______________ M after 2105 s have passed. B) The decomposition of nitramide in aqueous solution at 25 ½C NH2NO2(aq)

Explanation / Answer

A)
use:
[R]t=[R]o * e^(-k*t)
    = 0.183 *e^(-6.7*10^-4*2105)
    = 0.045 M

Ans: 0.045 M

B)
use:
[R]t=[R]o * e^(-k*t)
0.211 = 0.850 *e^(-k*21975)
k= 6.34*10^-5 s-1

Ans: 6.34*10^-5 s-1

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