Reaction Rate Formula:
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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.
The calculator uses the formula:
Where:
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.
Details: Accurate reaction rate calculation is crucial for reactor design, process optimization, and safety assessments in chemical processes.
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.
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 CA = CB = 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.