NEETChemistryChemical Kinetics
The overall order of a chemical reaction is 1.5 . What will be the unit of the rate constant for this reaction?
Options
- Amol ^ 0.5 L ^ -0.5 s ⁻¹
- Bmol ^ -0.5 L ^ 0.5 s ⁻¹
- Cmol ^ -1.5 L ^ 1.5 s ⁻¹
- Dmol ^ 1.5 L ^ -1.5 s ⁻¹
Correct answer
B. mol ^ -0.5 L ^ 0.5 s ⁻¹
Step-by-step solution
The unit of the rate constant k for a reaction of n -th order is given by ( mol L ⁻¹)^ 1-n s ⁻¹ . Given that the overall order of the reaction is n = 1.5 . Substituting the value of n in the general formula: Unit of k = ( mol L ⁻¹)^ 1-1.5 s ⁻¹ Unit of k = ( mol L ⁻¹)^ -0.5 s ⁻¹ Unit of k = mol ^ -0.5 L ^ 0.5 s ⁻¹ Therefore, the correct unit is mol ^ -0.5 L ^ 0.5 s ⁻¹ . Answer: mol ^ -0.5 L ^ 0.5 s ⁻¹