MHT CET202314 May 2023Evening ShiftChemistryChemical KineticsActual
Calculate the rate constant of the first order reaction if 80 % of the reactant decomposes in 60 minutes.
Options
- A2.68 10⁻² minute ⁻¹
- B5.36 10⁻² minute ⁻¹
- C1.34 10⁻² minute ⁻¹
- D8.1 10⁻² minute ⁻¹
Correct answer
A. 2.68 10⁻² minute ⁻¹
Step-by-step solution
aligned k & = 2.303 t ₁₀ [ A ]₀ [ ~A ]_ t & = 2.303 60 ₁₀ (100) (20) = 2.303 60 ₁₀ 10 2 & = 2.303 60 [ ₁₀(10)- ₁₀(2) ] & = 2.303 60 0.699=2.68 10⁻² minute ⁻¹ aligned