1. The reaction of fluorine gas and chlorine dioxide gas is first order in fluor
ID: 807401 • Letter: 1
Question
1.
The reaction of fluorine gas and chlorine dioxide gas is first order in fluorine and first order in chlorine dioxide. The reaction has a rate constant of 1.23 M-1 s-1. Calculate the rate of the reaction when [F2] = 0.100 M and [ClO2] = 0.892 M.
use either decimal or 1.23E-4 notation
2.
Dinitrogen tetroxide gas decomposes into NO2(g) by a first order mechanism. The half-life of this reaction at 400.0 K is 1.77 seconds.
Given: The [N2O4]o = 0.200 M.
Calculate the [NO2] after 4.00 seconds. Report answer in Molarity
Explanation / Answer
1. Given,
k=1.23 M-1s-1
Also reaction is 1st order wrt F2 and ClO2
ie,
ra=k[F2][ClO2]
=1.23*0.10*0.892
rate of reactio=0.1098 M/sec
____________
2.
Given, t1/2=1.77 sec
k=0.693/k=0.693/1.77=0.3915 s-1
Also[N2O4]0=0.200M
For 1st order reaction
ln([N2O4]/[N2O4]0)=-kt
ln([N2O4]/0.200)=-0.3915*4.00
[N2O4]=0.042 M
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