AP EAMCET202120 Aug 2021Evening ShiftChemistryChemical KineticsActual
For a A + B → products the rate of the reaction is given by Rate = K [ A ] [ B ] 2 . The units of rate constant ( K ) will be
Options
- AmolL - 1 S - 1
- B  L   mol - 1   S - 1
- Cmol 2 L - 2 S - 1
- Dmol - 2 L 2 S - 1
Correct answer
D. mol - 2 L 2 S - 1
Step-by-step solution
Rate of reaction = = K [ A ] [ B ] 2 The unit for the rate of reaction is mol   L - 1 S - 1 and the unit of concentration is mol   L - 1 . So, Rate   of   reaction =   K [ A ] [ B ] 2 mol   L - 1 S - 1 = K × mol   L - 1 × mol   L - 1 2 K = mol   L - 1 S - 1 mol   L - 1 × mol 2   L - 2 = mol - 2 L 2 S - 1 Hence, the unit of rate constant K is mol - 2 L 2 S - 1 .