Question

For the following reaction scheme (homogeneous), the rate
constant has units : A + B□(→┴k )C
(a) sec⁻¹ mole (b) sec⁻¹
(c) sec⁻¹ litre mole⁻¹ (d) sec

Answer 1

I think it is (b) sec-1.

Answer 2

For the given reaction the unit of the rate constant of the reaction is sec⁻¹ litre mole⁻¹ .

• Since the reaction is homogeneous , it is an elementary reaction and the order of the reaction with respect to the reactants is equal to the stoichiometric constants.
• Therefore, the rate law can be written as rate = k.[A].[B]
• So, k= rate/([A].[B]) , hence, the units of k are sec⁻¹ litre mole⁻¹ .