Eyring Equation:
From: | To: |
Definition: This calculator determines the rate constant of a chemical reaction using the Eyring equation from transition state theory.
Purpose: It helps chemists and chemical engineers predict reaction rates based on thermodynamic activation parameters.
The calculator uses the Eyring equation:
Where:
Explanation: The equation relates the reaction rate to the temperature and the activation parameters of the transition state.
Details: Accurate rate constants are essential for reaction engineering, kinetic modeling, and process design in chemical industries.
Tips: Enter the temperature in Kelvin, activation entropy in J/(K·mol), and activation enthalpy in J/mol. Temperature must be > 0K.
Q1: What are typical values for activation parameters?
A: ΔS‡ ranges from -200 to +200 J/(K·mol), ΔH‡ typically 50-200 kJ/mol (convert to J/mol for calculation).
Q2: How does temperature affect the rate constant?
A: Rate generally increases with temperature, following the exponential terms in the Eyring equation.
Q3: What's the difference between Arrhenius and Eyring equations?
A: Eyring provides a physical interpretation via transition state theory, while Arrhenius is purely empirical.
Q4: Can I use this for enzyme-catalyzed reactions?
A: Yes, but biological systems may require additional considerations like pH effects.
Q5: Why are the constants so small?
A: The fundamental constants (kB, h) are very small, but the exponential terms often compensate.