Question

$A\to B$ is a first order reaction with rate $6.6\times {10}^{-5}{m-s}^1$. When $\left[A\right]$ is $0.6m$, rate constant of the reaction is __________

• A. $1.1\times {10}^{-5}{s}^{-1}$
• B. $1.1\times {10}^{-4}{s}^{-1}$
• C. $9\times {10}^{-5}{s}^{-1}$
• D. $9\times {10}^{-4}{s}^{-1}$

Answer 1

The correct option is B $1.1\times {10}^{-4}{s}^{-1}$

Rate of a first order reaction is given by the formula $Rate=K[A{]}_t$, where $K$ is the rate constant and $[A{]}_t$ is the concentration at any time t. Therefore, we can write:

$Rate=K[A{]}_t$

$6.6\times {10}^{-5}=K\times 0.6$

$K=1.1\times {10}^{-4}{s}^{-1}$