Chemistry Reaction Kinetics UHS 2024
PMDC Verified Question 4 of 80
Which of the following is CORRECT Arrhenius equation?
A
\( K = Ae^{-E_a/QT} \)
B
\( K = Ae^{-E_a/RT} \)
C
\( K = Ae^{-E_a/ST} \)
D
\( K = Ae^{-E_a/UT} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( K = Ae^{-E_a/RT} \)
Concept:

The Arrhenius equation mathematically models how the rate constant of a chemical reaction varies with absolute temperature and activation energy.

Formula:

$$ k = A e^{-E_a / RT} $$

Solution:

  • \( k \) is the rate constant.
  • \( A \) is the Arrhenius pre-exponential factor (frequency of collisions).
  • \( E_a \) is the activation energy.
  • \( e \) is the mathematical base of natural logarithms.
  • \( R \) is the universal gas constant.
  • \( T \) is the absolute temperature in Kelvin.
  • Therefore, the correct constant in the denominator of the exponent is \( R \).


Why other options are incorrect:

The variables \( Q, S, \) and \( U \) do not represent the universal gas constant in standard thermodynamic or kinetic formulas.

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