MUKUBA UNIVERSITY SCHOOL OF MATHEMATICAL AND NATURAL SCIENCES DEPARTMENT OF CHEMISTRY

ASSIGNMENT 1 / TUTORIAL SHEET 1 DUE DATE: 08/05/ 2024 By 16:00. 1. Explain the meaning of the following terms as applied in the study of reaction kinetics (a) Molecularity (b) Rate law (c) Order of reaction (d) Heterogeneous catalysis 3. In monitoring a chemical reaction, the stopped-flow technique can be used applied. i) Explain in not more than three sentences the stopped-flow method. ii) Give at least two advantages of applying this particular method. 4. For the reaction of the form A → B + C, using the differencial rate expression and the rate law assuming that the reaction is second order show that the time , t = ([A]0 – [A]t) / k[A]t [A]0. 5. Given the following experimental data, find the rate law and the rate constant for the following reaction: NO (g) + NO2 (g) + O2 (g)  N2O5 (g) Run [NO]0, M [NO2]0, M [O2]0, M Initial Rate M/s 1 0.10 0.10 0.10 2.1 X 10-2 2 0.20 0.10 0.10 4.2 x 10-2 3 0.20 0.30 0.20 1.26 x 10-1 4 0.10 0.10 0.20 2.1 x 10-2 6. The following data have been obtained for the decomposition of N2O5 (g) at 67°C according to the reaction 2 N2O5 (g) → 4 NO2 (g) + O2 (g). t /min 0 1 2 3 4 5 [N2O5] / (mol/dm3 ) 1.000 0.705 0.497 0.349 0.246 0.173 i) By plotting suitable graphs determine the order of the reaction ii) Determine the rate constant iii) What is the half-life for this decompo