Reactant Concentration of Third Order Irreversible Reaction Calculator

Concentration of Reactant A Formula:

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

Reaction Rate:

mol/m³·s

Rate Constant (k₃):

m⁶/mol²·s

Concentration of Reactant B:

mol/m³

Concentration of Reactant D:

mol/m³

Concentration of Reactant A (mol/m³):

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1. What is Reactant Concentration in Third Order Reactions?

Definition: This calculator determines the concentration of reactant A in a third-order irreversible chemical reaction based on reaction rate, rate constant, and concentrations of other reactants.

Purpose: It helps chemists and chemical engineers analyze reaction kinetics and determine reactant concentrations in complex reactions.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

\( C_A \) — Concentration of reactant A (mol/m³)
\( r \) — Reaction rate (mol/m³·s)
\( k_3 \) — Rate constant for third order reaction (m⁶/mol²·s)
\( C_B \) — 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 rate constant and concentrations of the other reactants to determine the concentration of reactant A.

3. Importance of Reactant Concentration Calculation

Details: Accurate calculation of reactant concentrations is crucial for reaction optimization, process design, and safety considerations in chemical engineering.

4. Using the Calculator

Tips: Enter the reaction rate, rate constant, and concentrations of reactants B and D. All values must be > 0. The calculator provides the concentration of reactant A.

5. Frequently Asked Questions (FAQ)

Q1: What defines a third-order reaction?
A: A third-order reaction has a rate that depends on the product of three reactant concentrations or the cube of one reactant concentration.

Q2: How do I determine the rate constant (k₃)?
A: The rate constant is typically determined experimentally by measuring reaction rates at known reactant concentrations.

Q3: What units should I use for inputs?
A: Use consistent SI units: mol/m³ for concentrations, mol/m³·s for reaction rate, and m⁶/mol²·s for the rate constant.

Q4: Can this calculator be used for reversible reactions?
A: No, this calculator is specifically designed for irreversible third-order reactions.

Q5: What if my reaction involves different stoichiometry?
A: The formula assumes a reaction of the form A + B + D → products. Adjustments may be needed for different stoichiometric coefficients.