Question

Rate of a reaction can be expressed by Arrhenius equation as, $k=A{e}^{-E/RT}$. In this equation, $E$ represents:

• A. the energy above which all the colliding molecules will react
• B. the energy below which colliding molecules will not react
• C. the total energy of the reacting molecules at a temperature $T$
• D. the fraction of molecules with energy greater than the activation energy of the reaction

Answer 1

Answer: (B)

the energy below which colliding molecules will not react

E represents the energy of activation which implies it is the energy below which colliding molecules will not react

Arrhenius equation gives the dependence of the rate constant $k$ of a chemical reaction on the absolute temperature $T$ (in Kelvin), where $A$ is the pre-exponential factor (or simply the prefactor), $E_a$ is the activation energy, and R is the Universal gas constant:

By Arrhenius equation, $k=A{e}^{\frac{-Ea}{RT}}$