Arrhenius Equation

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Arrhenius equation expresses k as:

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$k = A e^{(} - E a / RT)$

$k = A / e^{(} E a RT)$

$k = e^{(} A RT / E a)$

k = A R T / Ea

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Subject: chemistry
Chapter: chemical kinetics
Topic: arrhenius equation
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

$k = A e^{(} - E a / RT)$

Arrhenius Relationship: Describes how the rate constant $k$ varies with temperature.
Parameters:
- $A$ : Pre-exponential factor (frequency factor).
- $E_{a}$ : Activation energy.
- $R$ : Gas constant ( $8.314 J mol^{- 1} K^{- 1}$ ).
- $T$ : Absolute temperature (in Kelvin).
Equation: $k = A e^{- \frac{E _{a}}{RT}}$ .
Significance: The term $e^{- E_{a} / RT}$ represents the fraction of molecules that have energy equal to or greater than the activation energy.

This easy difficulty chemistry question is from the chapter chemical kinetics, covering the topic of arrhenius equation. It appeared in the 2025 exam.

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Arrhenius Equation

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