COMEDK2021ChemistryChemical Kinetics
Determine the specific rate constant of a first-order reaction if its half-life period is 1402 s.
Options
- A4.94 10⁻³ ~s ⁻¹
- B0.49 10⁻³ ~s ⁻¹
- C0.49 10⁻⁴ ~s ⁻¹
- D4.94 10⁻⁵ ~s ⁻¹
Correct answer
B. 0.49 10⁻³ ~s ⁻¹
Step-by-step solution
For a first-order reaction: k = 0.693 t_ 1/2 k = 0.693 1402 4.943 10⁻⁴ s⁻¹ k 0.49 10⁻³ s⁻¹