Answer:
E
Explanation:
A second order reaction is one in which the reaction rate is proportional to the concentrations of the 2 reactants. We only consider the reactants whose concentration are changing however.
For example, in the case:
A + B ----> C + D , provided that both A and B undergo concentration changes, the rate is proportional to the product of their concentrations.
Now, like we know, the unit of the reaction rate is per second I.e 1/s or simply s^-1 . Also it is important to note that the concentration of the reactants is exprested in units of mol/L. We can now mathematically calculate the unit of the rate constant.
Mathematically,
R = k × [A] [B]
Hence,
S^-1 = k × (mol/L)(mol/L)
S^
s^-1 = k × (mol/L)^2
K = s^-1 ÷ (mol/L)^2
K = s^-1 × L^2 × mol^-2.
