The following results were obtained during kinetic studies of the reaction;
Question:

The following results were obtained during kinetic studies of the reaction;

The time (in minutes) required to consume half of $\mathrm{A}$ is:

  1. 5

  2. 10

  3. 1

  4. 100


Correct Option: 1

Solution:

From experiment 1 and II, it is observed that order of reaction w.r.t. (3) is zero.

From experiment II and III, $\alpha$ can be calculated as:

$\frac{1.386 \times 10^{-2}}{6.93 \times 10^{-3}}=\left(\frac{0.2}{0.1}\right)^{\alpha}$

$\therefore \quad \alpha=1$

Now, $\quad$ Rate $=\mathrm{K}[\mathrm{A}]^{1}$

or, $6.93 \times 10^{-3}=K(0.1)$

$K=6.93 \times 10^{-2}$

For the reaction, $2 \mathrm{~A}+\mathrm{B} \rightarrow$ Products

$2 K t=\ln \frac{[\mathrm{A}]_{0}}{[\mathrm{~A}]}$

$\therefore \quad t_{1 / 2}=\frac{0.693}{2 K}=\frac{0.693}{0.693 \times 10^{-2} \times 2}$

$t_{1 / 2}=5$

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