Rate Constant of Third Order Irreversible Reaction with Two Equal Reactant Concentrations Calculator

Rate Constant Formula:

\[ k_3 = \frac{r}{C_A \times (C_B)^2} \]

Reaction Rate:

mol/m³·s

Concentration of Reactant A:

mol/m³

Concentration of Reactant B:

mol/m³

Rate Constant (m⁶/mol²·s):

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

Definition: This calculator determines the rate constant for a third-order irreversible reaction involving two reactants with different concentrations.

Purpose: It helps chemists and chemical engineers analyze reaction kinetics and design chemical reactors.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ k_3 = \frac{r}{C_A \times (C_B)^2} \]

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)

Explanation: The reaction rate is divided by the product of reactant A concentration and the square of reactant B concentration.

3. Importance of Rate Constant Calculation

Details: Accurate rate constants are essential for predicting reaction behavior, designing reactors, and optimizing chemical processes.

4. Using the Calculator

Tips: Enter the reaction rate in mol/m³·s, concentrations of both reactants in 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 equals 3 (here 1 for A + 2 for B = 3).

Q2: What units does the rate constant have?
A: For this third-order reaction, the units are m⁶/mol²·s.

Q3: Can I use concentrations in different units?
A: Yes, but you'll need to adjust the calculation to maintain consistent units throughout.

Q4: How do I determine the reaction rate?
A: The reaction rate is typically determined experimentally by measuring concentration changes over time.

Q5: What if my reactants have equal concentrations?
A: The formula simplifies when CA = CB, but this calculator handles the general case of unequal concentrations.