Arrhenius Equation for 2nd Order:
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Definition: The Arrhenius constant (A), also called the frequency factor, represents the frequency of collisions with proper orientation for a second-order chemical reaction.
Purpose: This calculator determines the pre-exponential factor in the Arrhenius equation for second-order reactions.
The calculator uses the Arrhenius equation:
Where:
Explanation: The equation relates the reaction rate constant to temperature and activation energy.
Details: The frequency factor helps predict reaction rates at different temperatures and understand reaction mechanisms.
Tips: Enter the rate constant (k), activation energy (Ea), and temperature (T). All values must be positive.
Q1: What are typical values for the Arrhenius constant?
A: For second-order reactions, A typically ranges from 107 to 1011 m³/mol·s.
Q2: How does temperature affect the Arrhenius constant?
A: The Arrhenius constant is theoretically temperature-independent, though it may vary slightly in practice.
Q3: What's the difference between first and second order Arrhenius constants?
A: Second-order constants have units of m³/mol·s, while first-order are in s-1.
Q4: Can I use this for gas phase reactions?
A: Yes, but ensure your units are consistent (use pressure units if working with gas pressures).
Q5: Why is the exponential term important?
A: It represents the fraction of molecules with sufficient energy to overcome the activation barrier.