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# Parallel Reaction - Chemical Kinetics Chemistry Notes | EduRev

## Physical Chemistry

Created by: Asf Institute

## Chemistry : Parallel Reaction - Chemical Kinetics Chemistry Notes | EduRev

The document Parallel Reaction - Chemical Kinetics Chemistry Notes | EduRev is a part of the Chemistry Course Physical Chemistry.
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PARALLEL REACTION

Parallel reaction are those reaction in which the reactant can form one of two or more products

Consider the following parallel reaction in which reactant A can form two products B & C.

The rate law for the reactant and products are :

= â€“kB[A] â€“ kc[A] = â€“(kB + kC)[A]                         â€¦(1)

= kB[A]                                â€¦(2)

= kC[A]                              ....(3)

Integration of equat ion (1) with the init ial condit ion [A]0 â‰  0 and [B] = 0 = [C] yields

[A] = [A]0 e-(kB + kC )t                         .......(4)

Integration of equation (2), we get

â€¦(5)
Similarly

â€¦(6)
i.e. the ratio of concentration of product is

i.e. the product concentration ratio remains constant with time.
The yield, Ï†, is defined as the probability that a given product will be formed by decay of the reactant.

The quantum yield of product [B] is Ï†B = yield of [B] =

The quantum yield of product [C] is

Problem.  Find the quantum yield of [B] & [C] in the following reaction

Sol.

â€¦(1)
â€¦(2)

then

Problem.  Find the quantum yield of [B], [C] & [D] in the following reaction.

Sol.

â€¦(1)

â€¦(2)

â€¦(3)

The ratio of formation of product [B], [C] & [D] are

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## Physical Chemistry

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