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327
*13.
Ans.
What is molecularity of an elementary reaction?
(a) Definition : The molecularity of an elementary reaction is defined as the number of
reactant molecules taking part in the reaction.
(b) Explanation :
(1) It is a theoretical concept.
(2) It is always an integer and never be a fraction or zero.
(3) It does not change with experimental conditions.
(4) It is the property of only elementary reactions and has no meaning for complex reactions.
(c) On the basis of molecularity, chemical reactions are classified as follows.
(1) Unimolecular reaction: It is the reaction, in which only one molecule of reactant is
involved. for e.g. Br2 (g) ⎯⎯
→ 2Br (g)
(2) Bimolecular reaction: It is the reaction, in which two molecules of reactants are involved.
for e.g. H 2 + I 2 ⎯⎯
→ 2HI
(3) Trimolecular reaction: It is the reaction, in which three molecules of reactants are
involved.
*14.
Ans.
*15.
Distinguish between order and molecularity.
Refer 5.2 (j)
The gas-phase reaction between NO and Br2 is represented by the equation.
2NO (g) + Br2 (g) ⎯⎯
→ 2NOBr (g)
(a) Write the expression for the rate of consumption of reactants and formation of products.
(b) Write the expression for the rate of overall reaction in terms of rates of consumption
of reactants and formation of products.
Ans.
2 NO (g) + Br2 (g) ⎯⎯
→ 2NOBr (g)
– d[NO]
dt
– d[Br2 ]
Rate of consumption or Br2 at time t =
dt
d[NOBr]
Rate of formation of NOBr at time t =
dt
– d[Br2 ]
– d[NO]
d[NOBr]
(b) Rate of reaction =
=
=
dt
dt
dt
(a) Rate of consumption of No at time t =
*16.
The decomposition of N2O5 is represented by the equation
2N 2O 5 (g) ⎯⎯
→ 4NO 2 (g) + O 2 (g)
(a) How is the rate of formation of NO2 related to the rate of formation of O2?
Chapter - 5 Chemical Kinetics
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