Consider a parallel reaction follow first order chemical kinetics
Let t=0 concentration of (A) is [A]0 and after time (t) concentration of (A) and (B) are [A]t and [B]t respectively .
Concentration of [B] and [C] after time t:
Percentage Yield of
Product:
ILLUSTRATIVE EXAMPLE (1): An organic
compound A decomposes following two parallel first order mechanisms:
Calculate
the concentration ratio of C to A, if an experiment is allowed to start with
only A for one hour.
SOLUTION:
ILLUSTRATIVE EXAMPLE (2): An organic compound A decomposes by
following two parallel first order mechanisms:
Select the correct
statement(s)
(A) If three moles of A
are completely decomposed then 2 moles of B and 1 mole of C will be
formed.
(B) If three moles of A
are completely decomposed then 1 moles of B and 2 mole of C will be
formed.
(C) half life for the
decomposition of A is 20 min
(D) half life for the
decomposition of B is 0.33 min
SOLUTION: (BC)
Generalisation of parallel reaction:
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