Rate Constant Formula:
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Definition: The rate constant for a third-order reaction quantifies the reaction rate per unit concentration of each reactant raised to the first power (for three reactants).
Purpose: This calculator helps determine the rate constant for third-order irreversible reactions in chemical kinetics studies.
The calculator uses the formula:
Where:
Explanation: The reaction rate is divided by the product of the concentrations of all three reactants to obtain the rate constant.
Details: The rate constant is fundamental in chemical kinetics as it provides quantitative information about the speed of a chemical reaction under specific conditions.
Tips: Enter the reaction rate and concentrations of all three reactants. All values must be > 0. The result is given with high precision (10 decimal places) due to the typically small values of third-order rate constants.
Q1: What are typical units for third-order rate constants?
A: For third-order reactions, the units are typically m⁶/mol²·s in SI units.
Q2: Are true third-order reactions common?
A: True termolecular reactions (three molecules colliding simultaneously) are rare. Many apparent third-order reactions actually proceed through multiple steps.
Q3: How does temperature affect the rate constant?
A: Rate constants generally increase with temperature according to the Arrhenius equation.
Q4: Can this calculator be used for other reaction orders?
A: No, this is specifically for third-order reactions with three reactants. Different formulas apply to other reaction orders.
Q5: What if my reaction has different stoichiometry?
A: The rate law depends on the reaction mechanism, not just stoichiometry. Consult kinetic data for your specific reaction.