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EC number: 203-444-5
CAS number: 106-93-4
Figure 1 shows a series of typical OH decay plots obtained for the OH
reaction with CH2BrCH2Br. The concentration of the reactant gas,
[CH2BRCH2BR], is shown on the right side of the figure for each set of
points and has been varied over a range of about a factor of 5 in this
series of experiments. The effective bimolecular rate coefficient for
each line can be obtained by dividing the first-order rate constant from
the slop of the line by the average linear flow velocity v and the
reactant gas concentration. An alternative way to treat the data is
shown in Fig. 2, where the first-order rate constants from Fig. 1 (in
s-1) are plotted as a function of the reactant concentration. An average
bimolecular rate coefficient for the whole set is given by the slope of
the line through the data. Since the line very nearly goes through the
origin, it is clear that the same result is obtained either averaging
the individual bimolecular rate coefficients or using the set of
first-order costants and concentrations as in Fig. 2. This is true of
nearly all of the reactions reported here.
Bromine and chlorine substitution are roughly equivalent and both tend
to weaken the remaining (C-H) bonds and increase the OH reactivity.
Table 1. Rate constant summary for this work and
other measurements near 296 K.
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