Question

1. For a first order reaction AB
the rate constant is x min". If the
initial concentration of A is 0.01M , the
concentration of A after one hour is
given by the expression.
a) 0.01 e*
b) 1x10(1-e *0x)
c) (1x102) d) none of these
​

Answer 1

For first order reaction,

A⟶B

Rate =k×[A]

Given, rate =2.0×10

−5

molL

−1

s

−1

[A] = Conc. of A = 0.01 M

So, 2.0×10

−5

=k×0.01

k=

0.01

2.0×10

−5

s

−1

=2.0×10

−3

s

−1

For first order reaction,

t

1/2

=

k

0.693

=

2.0×10

−3

0.693

=346.5=347s

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