Consider a certain reaction A → Products ...

NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

Question : 24 of 39

Marks: +1, -0

Consider a certain reaction A → Products with

k = 2.0 \times 10^{-2} \mathrm{s}^{-1}

. Calculate the concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol L

^{-1}

Solution:

The units of k show that the reaction is of first order.

Hence,

k = \frac{2.303}{t} \log \frac{[R_0]}{[R]}

or,

2.0 \times 10^{-2} = \frac{2.303}{100} \log \frac{1.0}{[R]}

or,

\log [R] = -0.8684

\Rightarrow [R] =

Antilog

(-0.8684)

=0.1354 \mathrm{mol} \mathrm{L}^{-1}

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