|Kinetics : Order and Molecularity|
Molecularity - The number of molecules consumed in a chemical reaction
Step 1: N2O5
NO2 + NO3
Step 2: NO2 + NO3 NO2 + NO + O2
Step 3: NO + NO3 2 NO2
Order - Describes the relationship between the rate of a step in a chemical reaction and the concentration of one of the reactants consumed in that step.
Rate = k[N2O5]
The above reaction is first order with respect to [N2O5] and first order overall.
The rate of the overall reaction is the sum of the orders of all the reactants
Rate = k[HI]2
The above reaction is second order with respect to [HI] and second order overall.
Rate = [NO]2[O2]
The above reaction is first order with respect to [O2] and second
order with respect to [NO].
The overall reaction is third order, or higher order.
Rate = [NO]1/2[Cl2]3
The above reaction is mixed order with respect to [NO] and higher order with respect to [Cl2]3.
Next: "Sample Rate Calculations"