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The rate constant is also known as the proportionality constant in an elementary reaction. The rate constant aids in determining the reaction's speed.

The total number of molecules or ions in an elementary reaction that engages in the rate-determining phase is the reaction's molecularity.

Concentration of A = 20mM

Reaction Velocity = 5渭m/min^-1

The velocity of an instantaneous reaction is calculated using the expression $\mathrm{v}=\mathrm{k}\left[\mathrm{A}\right]$.

Where,

v is reaction velocity.

K is reaction constant.

[A] is the concentration of A.

On rearranging the expression, the velocity of an instantaneous reaction is calculated as

$$\begin{gathered} \mathrm{k}=\frac{\mathrm{v}}{\left[\mathrm{A}\right]} \\ 鈥�=\frac{5\mathrm{渭惭}鈥�{\min }^{-1}}{20\mathrm{mM}} \\ 鈥�=2.5脳{10}^{-4}{\min }^{-1} \end{gathered}$$

There is only one rate-determining step in the reaction described. In this case, the rate-determining step involves only one molecule of A. As a result, the molecularity of the reaction is 1.