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

Definition: This calculator computes the reaction rate for a third-order irreversible chemical reaction involving two reactants.

Purpose: It helps chemists and chemical engineers determine the rate at which reactants are converted to products in specific reaction conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( r \) — Reaction rate (mol/m³·s)
• \( k_3 \) — Third-order rate constant (m⁶/mol²·s)
• \( C_A \) — Concentration of reactant A (mol/m³)
• \( C_B \) — Concentration of reactant B (mol/m³)

Explanation: The reaction rate depends on the rate constant multiplied by the concentration of reactant A and the square of the concentration of reactant B.

3. Importance of Reaction Rate Calculation

Details: Accurate reaction rate calculation is crucial for reactor design, process optimization, and safety assessments in chemical processes.

4. Using the Calculator

Tips: Enter the rate constant (default 0.0002 m⁶/mol²·s), concentration of reactant A (default 1.1 mol/m³), and concentration of reactant B (default 8.2 mol/m³). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What makes a reaction third-order?
A: A reaction is third-order when the sum of the exponents in the rate law is 3 (in this case, 1 for A + 2 for B = 3).

Q2: What are typical units for k₃?
A: For third-order reactions, the rate constant typically has units of m⁶/mol²·s.

Q3: How does concentration affect reaction rate?
A: The rate increases with higher concentrations, especially for reactant B which has a squared dependence.

Q4: What if my reactants have equal concentrations?
A: The formula simplifies to r = k₃C³ when C_A = C_B = C.

Q5: Can this be used for reversible reactions?
A: No, this calculator is specifically for irreversible reactions. Reversible reactions require more complex rate laws.