For a reaction the rate law expression is represented as follows:​ Rate = k [A][B]^1/2

Question

For a reaction the rate law expression is represented as follows: 

Rate = k [A][B]^{\(\frac{1}{2}\)} 

i. Interpret whether the reaction is elementary or complex. Give reason to support your answer. 

ii. Write the units of rate constant for this reaction if concentration of A and B is expressed in moles/L.

Answer 1

(i) Reaction is a complex reaction. 

Order of reaction is 1.5. 

Molecularity cannot be 1.5, it has no meaning for this reaction. The reaction occurs in steps, so it is a complex reaction. 

(ii) units of k are \(mol^{-\frac{1}{2}}L^{\frac{1}{2}}s^{-1}\)