By M. Mortimer, P.G. Taylor
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Additional resources for Chemical Kinetics and Mechanism
The form of this distribution depends on temperature and was worked out towards the end of the nineteenth century by the Scottish scientist James Clerk Maxwell. 1. It is worth noting that the area under each curve is the same and is a constant for a given sample since it represents the total number of molecules in that sample. Increasing the temperature clearly results in an increase in the number of more rapidly moving molecules, at the expense of the numbers moving more slowly, and the distribution becomes flatter and wider.
If we consider -d[NO%]ldt, which is a positive quantity, then d"02 I -; d[O7 I - d"OI 2dt dt dt These relationships are consistent with the fact that according to the stoichiometry, the rate of increase in the concentration of 0% is 'only equal to one-half of that for NO. 6) It is common practice in chemical kinetics (as well as in chemical thermodynamics) to use a chemical reaction written in an 'alphabetical' form to help to express a definition in a general way. Thus, we could write a chemical reaction with known stoichiometry as U A + hB + ...
At any time in the decomposition, the rate of decrease in the concentration of NO2 will be directly related to the rates of increase in the concentrations of NO and 0 2 , respectively. What is the relationship between these quantities? If we consider -d[NO%]ldt, which is a positive quantity, then d"02 I -; d[O7 I - d"OI 2dt dt dt These relationships are consistent with the fact that according to the stoichiometry, the rate of increase in the concentration of 0% is 'only equal to one-half of that for NO.
Chemical Kinetics and Mechanism by M. Mortimer, P.G. Taylor