Rate Constant of Third Order Irreversible Reaction Calculator

Rate Constant Formula:

\[ k_3 = \frac{r}{C_A \times C_B \times C_D} \]

Reaction Rate:

mol/m³·s

Concentration of Reactant A:

mol/m³

Concentration of Reactant B:

mol/m³

Concentration of Reactant D:

mol/m³

Rate Constant (m⁶/mol²·s):

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1. What is Rate Constant of Third Order Irreversible Reaction?

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.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ k_3 = \frac{r}{C_A \times C_B \times C_D} \]

Where:

\( k_3 \) — Rate constant for third-order reaction (m⁶/mol²·s)
\( r \) — Reaction rate (mol/m³·s)
\( C_A \) — Concentration of reactant A (mol/m³)
\( C_B \) — Concentration of reactant B (mol/m³)
\( C_D \) — Concentration of reactant D (mol/m³)

Explanation: The reaction rate is divided by the product of the concentrations of all three reactants to obtain the rate constant.

3. Importance of Rate Constant Calculation

Details: The rate constant is fundamental in chemical kinetics as it provides quantitative information about the speed of a chemical reaction under specific conditions.

4. Using the Calculator

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.

5. Frequently Asked Questions (FAQ)

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.