4), which relates the rate of a reaction to concentration
of reactants is called rate law or rate expression Thus, rate law is the
expression in which reaction rate is given in terms of molar
concentration of reactants with each term raised to some
power, which may or may not be same as the stoichiometric
coefficient of the reacting species in a balanced chemical
equation For example:
2NO(g) + O2(g) ® 2NO2 (g)
We can measure the rate of this reaction as a function of initial
concentrations either by keeping the concentration of one of the reactants
constant and changing the concentration of the other reactant or by
changing the concentration of both the reactants The following results
are obtained (Table 3