Question

A first order reaction is carried out with an initial
concentration of 10 mol per litre and 80% of the
reactant changes into the product. Now if the same
reaction is carried cut with an initial concentration
of 5 mol per litre for the same period the percentage
of the reactant changing to the product is.
(1) 40
(2) 80
(3) 160
(4) Cannot be calculated​

Answer 1

Answer:

a

0

=10 M

80% changed into product

∴a

t

=10

100

10×80

=2 M

If a

0

=5 M, In the same time duration same percentage of initial concentration changes into products because in first order reaction is independent from initial concentration.