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Last updated date: 05th Dec 2023
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In the equation Rate ${\text{ = }}\,\,{\text{ZAB}}\,{\text{.}}\,{{\text{e}}^{\dfrac{{{\text{ - Ea}}}}{{{\text{RT}}}}}}$, what does ${\text{ZAB}}$ mean?

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Hint: According to the collision theory, only a certain number of collisions between suitable reactant particles result in a perceptible or noticeable change; these successful changes are referred to as successful collisions.

Max Trautz and William Lewis both suggested collision theory in the years $1916$ and $1918$, respectively.
The rate of a chemical reaction can be expressed as ${\text{ZAB}}\,{\text{.}}\,{{\text{e}}^{\dfrac{{{\text{ - Ea}}}}{{{\text{RT}}}}}}$ using collision theory.
The collision frequency of the reactants ${\text{A}}$ and ${\text{B}}$ is represented by ${\text{ZAB}}$.
In the reaction ${\text{A}}\,{\text{ + }}\,{\text{B}}\, \to \,{\text{AB}}$. The reaction rate is proportional to the number of active collisions. As a result, the reaction rate can be expressed as ${\text{ZAB}}\,{\text{.}}\,{{\text{e}}^{\dfrac{{{\text{ - Ea}}}}{{{\text{RT}}}}}}$
${\text{Ea}}\,\left( {{\text{J/mol}}} \right)$ is the activation energy.