Chemistry · Differential and integral forms of zero and first-order reactions, their characteristics and half-lives
The rate constant of a first order reaction is 0.0693 min Time (in minutes) requ
The rate constant of a first order reaction is 0.0693 min\( ^{-1} \) Time (in minutes) required for reducing an initial concentration of 20 mol \( l i t^{-1} \) to 2.5 mol \( l i t^{-1} \) is :
- A. 40
- B. 30
- C. 20
- D. 10
Step-by-step solution
For a first-order reaction, t = (1/k) ln([A]0/[A]) = (1/0.0693) ln(20/2.5) = (1/0.0693) ln(8). Since ln(8) = 3 ln 2 ≈ 3×0.693 = 2.079, t = 2.079/0.0693 ≈ 30 minutes.
Related MCQs
- of a first order reaction was completed in 70 min. How much it will take for completion of a reaction?…
- Which of the following statements is not true?…
- A reaction of first - order completed in 90 minutes, hence, it is completed in approximately:…
- Assertion For the reaction \rightarrow \) ROH Na , the rate of reaction is reduced to half on reducing the concentration of RCl to half. Rea…
- For a reaction } \rightarrow \boldsymbol{B}_{(g)}+\boldsymbol{C}_{(g)}, \) the rate constant for the reaction is min At what concentration o…