Q. 255.0( 1 Vote )

a. Define order o

a. Order of a reaction: It is the sum of the power to which the concentration terms are raised in the rate law equation. It can be 0,1 or 2

Molecularity is the minimum no. of molecules taking part in a chemical reaction.
Order of reaction is applicable for complex reaction but molecularity has no meaning for the complex reaction.

b. Given: T1/2= 25 minutes

For 1st order reaction, T1/2=

k = = 0.0277 min-1

now, as 80% reaction is complete, so amount left [R] =100-80 = 20

T =

T =

T= 58.113 minutes

OR

a. k1= 2.5 × 104 s-1 T1= 270C = 300K

k2= 7.5 × 104 s-1 T2= ?

Ea= 19.147 × 103 J/mol

We know that

b. A bimolecular reaction is kinetically first order when one of the reactants is in excess.

For Example:

CH3COOCH3 + H2O (excess) CH3COOH + CH3OH

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