<p>Exercise 1: The liquid phase reaction between trimethylamine and n-propyl bromide was studied by Winkler and Hinshelwood by immersing sealed glass tubes containing the reactants in a constant-temperature bath. The results at 139.4 C are shown in the following Table.
Run t (min) Conversion (%)
1 13 11.2<br>
2 34 25.7<br>
3 59 36.7<br>
4 120 55.2 </p>
<p>Initial solutions of trimethylamine and n-propyl bromide in benzene, o.2 molal, were mixed, sealed in glass tubes, and placed in constant temperature bath. After various time intervals the tubes were removed and cooled to stop the reaction, and the contents were analyzed. The analysis depends on the fact that the product, a quaternary ammonium salt, is completely ionized. Hence the concentration of bromide ions can be estimated by titration.
The reaction may be written:</p>
<p>From this information determine the first-order and second-order specific rates k1 and k2 assuming that the reaction is irreversible over the conversion range covered by the data. Use both the integration and the differential method and compare the results. Which rate equation best it the experimental data?</p>