Question

(A) follows first order reaction, (A) $\to$ product.

The concentration of A changes from 0.1 to 0.025 M in 40 min.

Find the rate of reaction of A when the concentration of A is 0.01 M.

• A. $3.47\times {10}^{-4}Mmi{n}^{-1}$
• B. $3.47\times {10}^{-5}Mmi{n}^{-1}$
• C. $1.73\times {10}^{-4}Mmi{n}^{-1}$
• D. $1.73\times {10}^{-5}Mmi{n}^{-1}$

Answer 1

The correct option is A

$3.47\times {10}^{-4}Mmi{n}^{-1}$

For first order reaction,

$k=\frac{2.303}{t}log\frac{a}{a-x}$

$=\frac{2.303}{40}log\frac{0.1}{0.02}$

$=3.46\times {10}^{-2}$

$Rate=\left[k\right]A=3.46\times {10}^{-2}\times 0.01$

$=3.46\times {10}^{-4}$