define order of reaction what is molecularity of an elementary reaction
Answers
Answer:
Molecularity in chemistry is the number of molecules that come together to react in an elementary (single-step) reaction and is equal to the sum of stoichiometric coefficients of reactants in the elementary reaction with effective collision (sufficient energy) and correct orientation.elementary reaction.
(a) Molecularity of a reaction is always an integer.
(b) It doesn't change with experimental conditions.
(c) The molecularity of a reaction cannot have a fractional or zero values.
(d) The minimum value of the molecularity is one.
The molecularity of a reaction can be explained by considering the following example :
Consider a reaction, i.e.,
N2O5(g)⟶2NO2(g)+21O2(g)
In this reaction, only one molecule is taking part in the reaction, therefore the rate law expression for this reaction is :
Rate =k[N2O5]
Hence, the reaction is unimolecular and first order.
Similarly, a reaction can be bimolecular or trimolecular depending on the number of molecule taking part in the reaction.
Answer:
The sum of the powers of molar concentration of all the reacting species in the rate equation is known as order of the reaction.
The number of reacting species taking part in the reaction is called molecularity of the reaction.
Explanation: